Brain Pickings

Wanderlust: Rebecca Solnit on How Walking Vitalizes the Meanderings of the Mind

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“I suspect that the mind, like the feet, works at about three miles an hour. If this is so, then modern life is moving faster than the speed of thought, or thoughtfulness.”

“Of all ridiculous things,” Kierkegaard wrote in contemplating our greatest source of unhappiness, “the most ridiculous seems to me, to be busy — to be a man who is brisk about his food and his work.” Just a few years later, on the other side of the Atlantic, another sage of the ages considered a particularly perilous form of briskness — in 1861, Thoreau penned his timeless treatise on walking and the spirit of sauntering. Half a century later, Swiss modernist writer Robert Walser captured this spirit in his short story “The Walk,” which includes this exquisite line: “With the utmost love and attention the man who walks must study and observe every smallest living thing, be it a child, a dog, a fly, a butterfly, a sparrow, a worm, a flower, a man, a house, a tree, a hedge, a snail, a mouse, a cloud, a hill, a leaf, or no more than a poor discarded scrap of paper on which, perhaps, a dear good child at school has written his first clumsy letters.”

But no one has written about walking, its cultural history, and its spiritual rewards more beautifully and with more dimension than Rebecca Solnit in her 2000 masterpiece Wanderlust: A History of Walking (public library).

Walking is embodied presence in motion, presence at once with ourselves and with the world, inner and outer — an active presence of body and mind, which Solnit captures in the opening pages:

Where does it start? Muscles tense. One leg a pillar, holding the body upright between the earth and sky. The other a pendulum, swinging from behind. Heel touches down. The whole weight of the body rolls forward onto the ball of the foot. The big toe pushes off, and the delicately balanced weight of the body shifts again. The legs reverse position. It starts with a step and then another step and then another that add up like taps on a drum to a rhythm, the rhythm of walking. The most obvious and the most obscure thing in the world, this walking that wanders so readily into religion, philosophy, landscape, urban policy, anatomy, allegory, and heartbreak.

Art by Shaun Tan for the fairy tales of the Brothers Grimm. Click image for more.

Indeed, the metaphysical wanderings that the physical act precipitates are what makes walking transcend its utilitarian purpose of bipedal mobility. Solnit, who has also contemplated how we find ourselves by getting lost, examines this higher-order function of wanderlust:

Most of the time walking is merely practical, the unconsidered locomotive means between two sites. To make walking into an investigation, a ritual, a meditation, is a special subset of walking, physiologically like and philosophically unlike the way the mail carrier brings the mail and the office worker reaches the train. Which is to say that the subject of walking is, in some sense, about how we invest universal acts with particular meanings. Like eating or breathing, it can be invested with wildly different cultural meanings, from the erotic to the spiritual, from the revolutionary to the artistic. Here this history begins to become part of the history of the imagination and the culture, of what kind of pleasure, freedom, and meaning are pursued at different times by different kinds of walks and walkers.

Solnit readily acknowledges that the subjective experience of the walker is what shapes the route of this imaginative meandering through the various reaches of culture:

This history of walking is an amateur history, just as walking is an amateur act. To use a walking metaphor, it trespasses through everybody else’s field — through anatomy, anthropology, architecture, gardening, geography, political and cultural history, literature, sexuality, religious studies — and doesn’t stop in any of them on its long route. For if a field of expertise can be imagined as a real field — a nice rectangular confine carefully tilled and yielding a specific crop — then the subject of walking resembles walking itself in its lack of confines. And though the history of walking is, as part of all these fields and everyone’s experience, virtually infinite, this history of walking I am writing can only be partial, an idiosyncratic path traced through them by one walker, with much doubling back and looking around… The history of walking is everyone’s history, and any written version can only hope to indicate some of the more well-trodden paths in the author’s vicinity — which is to say, the paths I trace are not the only paths.

Art by Lisbeth Zwerger for 'Alice in Wonderland.' Click image for more.

With the hindsight of a decade and a half, Solnit’s book emerges as triply timely today, as we struggle to master that ever more precarious balancing act of living with presence in the age of productivity. She writes:

Thinking is generally thought of as doing nothing in a production-oriented culture, and doing nothing is hard to do. It’s best done by disguising it as doing something, and the something closest to doing nothing is walking. Walking itself is the intentional act closest to the unwilled rhythms of the body, to breathing and the beating of the heart. It strikes a delicate balance between working and idling, being and doing. It is a bodily labor that produces nothing but thoughts, experiences, arrivals.

In a sense, the creative rewards of walking parallel the creative rewards of boredom, both culturally and developmentally. Although a toddler’s first steps are a more obvious and thus more loudly celebrated milestone, the capacity for boredom — the ability to “do nothing with nobody all alone by yourself” — is an equally monumental, if much more invisible, developmental achievement for the child. Walking, like the capacity for boredom, is a form of intimacy with oneself — with one’s thoughts, one’s world, one’s imaginative and bodily sense of being. Solnit speaks to this beautifully:

Walking, ideally, is a state in which the mind, the body, and the world are aligned, as though they were three characters finally in conversation together, three notes suddenly making a chord. Walking allows us to be in our bodies and in the world without being made busy by them. It leaves us free to think without being wholly lost in our thoughts.

[…]

The rhythm of walking generates a kind of rhythm of thinking, and the passage through a landscape echoes or stimulates the passage through a series of thoughts. This creates an odd consonance between internal and external passage, one that suggests that the mind is also a landscape of sorts and that walking is one way to traverse it. A new thought often seems like a feature of the landscape that was there all along, as though thinking were traveling rather than making. And so one aspect of the history of walking is the history of thinking made concrete — for the motions of the mind cannot be traced, but those of the feet can.

Art by Lisbeth Zwerger for the fairy tales of the Brothers Grimm. Click image for more.

Indeed, the history of human creative endeavor is rife with artists and writers whose minds were propelled by rhythmic movement — something Solnit argues defines walking better than its purely transportational function:

Perhaps walking should be called movement, not travel, for one can walk in circles or travel around the world immobilized in a seat, and a certain kind of wanderlust can only be assuaged by the acts of the body itself in motion, not the motion of the car, boat, or plane. It is the movement as well as the sights going by that seems to make things happen in the mind, and this is what makes walking ambiguous and endlessly fertile: it is both means and end, travel and destination.

Movement is also an essential mode of dynamic interaction between self and other, self and world:

Many people nowadays live in a series of interiors — home, car, gym, office, shops — disconnected from each other. On foot everything stays connected, for while walking one occupies the spaces between those interiors in the same way one occupies those interiors. One lives in the whole world rather than in interiors built up against it.

And yet it gives one pause to consider that Solnit (to say nothing of Thoreau) is writing before smartphones and podcasts existed — before we had portable interiors in our pockets, which now accompany us on all walks by default, to a point of even co-opting this notion of connectedness to mean the very opposite. These portable interiors are now infringing on our interaction with the outside world — not only by blunting our attentiveness to the natural world, diminishing our willingness to “study and observe every smallest living thing” with “the utmost love and attention” but also, in densely populated epicenters of urbanity, by tampering with our ability to perform the intuitive pedestrian dance known as “the slip-and-slide.”

Writing on the precipice of a major cultural shift — before the iPhone, before Facebook, before Wikipedia — Solnit articulates the peril of this productivity-fetishism with extraordinary prescience:

I found [an ad] in the Los Angeles Times … for a CD-ROM encyclopedia, and the text that occupied a whole page read, “You used to walk across town in the pouring rain to use our encyclopedias. We’re pretty confident that we can get your kid to click and drag.” I think it was the kid’s walk in the rain that constituted the real education, at least of the senses and the imagination. Perhaps the child with the CD-ROM encyclopedia will stray from the task at hand, but wandering in a book or a computer takes place within more constricted and less sensual parameters. It’s the unpredictable incidents between official events that add up to a life, the incalculable that gives it value.

Art by Maira Kalman from 'My Favorite Things.' Click image for more.

Artist Maira Kalman — a supreme patron saint of walking, who memorably urged: “Go out and walk. That is the glory of life.” — captures this beautifully in her notion of the “in-between world” full of “moments inside the moments inside the moments,” which Solnit speaks to in considering the immense and endangered value of this vibrant in-betweenery of place and time:

The multiplication of technologies in the name of efficiency is actually eradicating free time by making it possible to maximize the time and place for production and minimize the unstructured travel time in between. New timesaving technologies make most workers more productive, not more free, in a world that seems to be accelerating around them. Too, the rhetoric of efficiency around these technologies suggests that what cannot be quantified cannot be valued — that that vast array of pleasures which fall into the category of doing nothing in particular, of woolgathering, cloud-gazing, wandering, window-shopping, are nothing but voids to be filled by something more definite, more productive, or faster paced… As a member of the self-employed whose time saved by technology can be lavished on daydreams and meanders, I know these things have their uses, and use them — a truck, a computer, a modem — myself, but I fear their false urgency, their call to speed, their insistence that travel is less important than arrival. I like walking because it is slow, and I suspect that the mind, like the feet, works at about three miles an hour. If this is so, then modern life is moving faster than the speed of thought, or thoughtfulness.

In the remainder of the wholly enchanting Wanderlust, Solnit goes on to explore the history of walking from antiquity’s spiritual pilgrimages to the acts of civil disobedience that shaped our modern world. Complement it with Thoreau’s foundational text on walking, then revisit Solnit on the color blue and what reading does for the human soul.

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I, Pencil: An Ingenious Vintage Allegory for the Invisible Hand and How Everything Is Connected

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“If you can become aware of the miraculousness which I symbolize, you can help save the freedom mankind is so unhappily losing.”

For an object this seemingly simple, the pencil is not only an artifact with a remarkably fascinating history but also an enduring staple of creative culture — from John Steinbeck, who kept exactly twelve sharpened pencils on his desk at all times, to David Byrne, who captured the human condition in pencil diagrams. But although it is one of humanity’s humble masterpieces of design and ingenuity, we continue to underappreciate the pencil’s genius.

In 1958, libertarian writer and Foundation for Economic Education founder Leonard Read (September 26, 1898–May 14, 1983) set out to remedy this civilizational injustice in a marvelous essay titled “I, Pencil,” published in Essays on Liberty (public library). In a clever allegory, Read delivers his enduring point about the power of free market economy. Casting the pencil as a first-person narrator, he illustrates its astounding complexity to reveal the web of dependencies and vital interconnectedness upon which humanity’s needs and knowledge are based, concluding with a clarion call for protecting the creative freedom making this possible.

Drawing by Wendy MacNaughton for Brain Pickings

Read begins:

I am a lead pencil — the ordinary wooden pencil familiar to all boys and girls and adults who can read and write.

Writing is both my vocation and my avocation; that’s all I do.

You may wonder why I should write a genealogy. Well, to begin with, my story is interesting. And, next, I am a mystery—more so than a tree or a sunset or even a flash of lightning. But, sadly, I am taken for granted by those who use me, as if I were a mere incident and without background. This supercilious attitude relegates me to the level of the commonplace. This is a species of the grievous error in which mankind cannot too long persist without peril. For, as a wise man observed, “We are perishing for want of wonder, not for want of wonders.”

Half a century before Thomas Thwaites set out to illustrate the complex interdependencies of what we call civilization by making a toaster from scratch, Read writes:

I, Pencil, simple though I appear to be, merit your wonder and awe, a claim I shall attempt to prove. In fact, if you can understand me — no, that’s too much to ask of anyone — if you can become aware of the miraculousness which I symbolize, you can help save the freedom mankind is so unhappily losing. I have a profound lesson to teach. And I can teach this lesson better than can an automobile or an airplane or a mechanical dishwasher because — well, because I am seemingly so simple.

Simple? Yet, not a single person on the face of this earth knows how to make me.

Tracing the pencil’s journey from raw material — “a cedar of straight grain that grows in Northern California and Oregon” — to the hands of “all the persons and the numberless skills” involved in its fabrication, Read considers the rich cultural and practical substrata of all these skills and production mechanisms:

Consider the millwork in San Leandro. The cedar logs are cut into small, pencil-length slats less than one-fourth of an inch in thickness. These are kiln dried and then tinted for the same reason women put rouge on their faces. People prefer that I look pretty, not a pallid white. The slats are waxed and kiln dried again. How many skills went into the making of the tint and the kilns, into supplying the heat, the light and power, the belts, motors, and all the other things a mill requires? Sweepers in the mill among my ancestors? Yes, and included are the men who poured the concrete for the dam of a Pacific Gas & Electric Company hydroplant which supplies the mill’s power!

Don’t overlook the ancestors present and distant who have a hand in transporting sixty carloads of slats across the nation from California to Wilkes-Barre!

He goes on to delineate the global reaches of the production process — from the pencil’s lead derived from graphite mined in Ceylon to Mexican candelilla wax used used to increase its strength and smoothness to the rapeseed oil Dutch East Indies involved in the creation of its “crowning glory,” the eraser — ultimately pointing to the pencil as a supreme example of Adam Smith’s “Invisible Hand” at work:

Actually, millions of human beings have had a hand in my creation, no one of whom even knows more than a very few of the others… There isn’t a single person in all these millions, including the president of the pencil company, who contributes more than a tiny, infinitesimal bit of know-how. From the standpoint of know-how the only difference between the miner of graphite in Ceylon and the logger in Oregon is in the type of know-how. Neither the miner nor the logger can be dispensed with, any more than can the chemist at the factory or the worker in the oil field — paraffin being a by-product of petroleum.

Here is an astounding fact: Neither the worker in the oil field nor the chemist nor the digger of graphite or clay nor any who mans or makes the ships or trains or trucks nor the one who runs the machine that does the knurling on my bit of metal nor the president of the company performs his singular task because he wants me. Each one wants me less, perhaps, than does a child in the first grade. Indeed, there are some among this vast multitude who never saw a pencil nor would they know how to use one. Their motivation is other than me. Perhaps it is something like this: Each of these millions sees that he can thus exchange his tiny know-how for the goods and services he needs or wants. I may or may not be among these items.

Above all, Read suggests, the pencil attests to the godliness of the human capacity for connected imagination. In a sardonic dual jab at religious creationism and excessive government control, Read summons the last line from Joyce Kilmer’s 1918 poem “Trees” and writes:

It has been said that “only God can make a tree.” Why do we agree with this? Isn’t it because we realize that we ourselves could not make one? Indeed, can we even describe a tree? We cannot, except in superficial terms. We can say, for instance, that a certain molecular configuration manifests itself as a tree. But what mind is there among men that could even record, let alone direct, the constant changes in molecules that transpire in the life span of a tree? Such a feat is utterly unthinkable!

I, Pencil, am a complex combination of miracles: a tree, zinc, copper, graphite, and so on. But to these miracles which manifest themselves in Nature an even more extraordinary miracle has been added: the configuration of creative human energies — millions of tiny know-hows configurating naturally and spontaneously in response to human necessity and desire and in the absence of any human master-minding! Since only God can make a tree, I insist that only God could make me. Man can no more direct these millions of know-hows to bring me into being than he can put molecules together to create a tree.

The above is what I meant when writing, “If you can become aware of the miraculousness which I symbolize, you can help save the freedom mankind is so unhappily losing.” For, if one is aware that these know-hows will naturally, yes, automatically, arrange themselves into creative and productive patterns in response to human necessity and demand — that is, in the absence of governmental or any other coercive master-minding — then one will possess an absolutely essential ingredient for freedom: a faith in free men. Freedom is impossible without this faith.

Just a few years earlier, pencil-lover Steinbeck had written in East of Eden: “The free, exploring mind of the individual human is the most valuable thing in the world.” Whether Read read Steinbeck and succumbed to cryptomnesia or arrived at this strikingly similar sentiment independently is only cause for speculation, but his larger point — one as pertinent to public policy as it is to the private creative endeavor — is what endures with its own timeless miraculousness:

If I, Pencil, were the only item that could offer testimony on what men can accomplish when free to try, then those with little faith would have a fair case. However, there is testimony galore; it’s all about us and on every hand. Mail delivery is exceedingly simple when compared, for instance, to the making of an automobile or a calculating machine or a grain combine or a milling machine or to tens of thousands of other things. Delivery? Why, in this area where men have been left free to try, they deliver the human voice around the world in less than one second; they deliver an event visually and in motion to any person’s home when it is happening; they deliver 150 passengers from Seattle to Baltimore in less than four hours; they deliver gas from Texas to one’s range or furnace in New York at unbelievably low rates and without subsidy; they deliver each four pounds of oil from the Persian Gulf to our Eastern Seaboard — half-way around the world — for less money than the government charges for delivering a one-ounce letter across the street!

The lesson I have to teach is this: Leave all creative energies uninhibited. Merely organize society to act in harmony with this lesson. Let society’s legal apparatus remove all obstacles the best it can. Permit these creative know-hows freely to flow. Have faith that free men will respond to the Invisible Hand. This faith will be confirmed. I, Pencil, seemingly simple though I am, offer the miracle of my creation as testimony that this is a practical faith, as practical as the sun, the rain, a cedar tree, the good earth.

Half a century after Read penned his brilliant essay, it was adapted into an animated film illustrating how the same “complex combination of miracles” plays out on various scales in our modern lives:

For an equally pause-giving contemporary counterpart, see The Toaster Project.

Perhaps Ada Lovelace, the world’s first computer programmer — and what, if not computing, is the height of Read’s miraculous web of know-hows? — put it best when she wrote that “everything is naturally related and interconnected.”

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The Midwifery of Creativity: Denise Levertov on How Great Works of Art Are Born

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“Showing anyone anything really amounts to removing the last thin film that prevents their seeing what they are looking at.”

Few things gladden the heart, at least this heart, more than the immortal evidence of great friendships between artists — that mostly invisible scaffolding of goodwill and kinship of spirit upon which creative culture is built and without which the heavy lonesomeness of the creative life would crush the artist. An encouraging word from a friend or mentor can work, and has worked, wonders for the creative spirit — there is ample evidence in the epistolary friendship of Thomas Mann and Hermann Hesse, young James Joyce’s correspondence with Ibsen, Mark Twain’s emboldening exchange with Helen Keller, Emerson’s career-making letter to Walt Whitman, and Frida Kahlo’s beam of compassion to Georgia O’Keeffe.

Among the most beautiful of these spiritually sustaining friendships is that between the poets Robert Duncan (January 7, 1919–February 3, 1988) and Denise Levertov (October 24, 1923–December 20, 1997). It began with a fan letter Duncan sent to Levertov in May of 1953 and continued for more than a quarter century, over the course of which they exchanged nearly 500 letters, now collected in The Letters of Robert Duncan and Denise Levertov (public library) — a formidable 800-page tome containing these two literary titans’ views on life, love, poetry, politics, family, fame, and the intricate machinery of creativity.

In one of the longest and most revelatory letters in the volume, penned between October 25 and November 2 of 1971, 48-year-old Levertov articulates her most fundamental creative credos more directly than in any of her public writings.

She considers what lends a poem — and any great works of art — its power:

I have always had a strong preference for works of art in which the artist was driven by a need to speak (in whatever medium) of what deeply stirred him — whether in blame or in praise. I’d sooner read Dubliners than Finnegans Wake. Beckett bores me. Most of Gertrude Stein bores me — she’s nice for tea but I wouldn’t want her for my dinner. I love George Eliot…

I should qualify the “deep stirring” I mean: I prefer … works where need to speak (in whatever medium was theirs) arose from experiences not of a technical nature but of a kind which people unconnected with that medium also shared (potentially anyway).

Illustrating this with an example that calls to mind Amanda Palmer’s assertion that “you’re a good artist when you make somebody else experience or feel something deep or unexpected,” Levertov writes:

A sculpture inspired by the potential of the piece of wood it is carved out of might move me by its beauty of proportion, texture, decorative qualities etc. but usually not as much as one behind which one can feel some other human experience, to which the artist-craftsman’s feeling for the wood contributes, so that the emerging inscape (the revealed inscape) is of the conjoining of some other life experience with the present experience of the wood, the material. Each grasped, revealed, by way of the other.

Elsewhere in the lengthy letter, she captures another aspect of this mutuality:

One can anyway only be shown something one knows already, needs already. Showing anyone anything really amounts to removing the last thin film that prevents their seeing what they are looking at.

Illustration by Ohara Hale for six rare recordings of Levertov reading her poetry. Click image to see more and listen.

But this “deep stirring” quality of great art, Levertov cautions, doesn’t arise from the rational appeal of the work’s subject matter, or what it is currently fashionable to call its “content” — a term I’ve long despised for implying the vacant filler of an unfeeling form. Rather, she argues in one of the most beguiling descriptions of the creative impulse, it comes from the artist’s sincere and insurmountable desire — need, even — to externalize a mysteriously moving interior experience, a private event of the psyche, into a public work of art:

I do not at all have a sense of luring anyone into the poetic by catching hold of them through my subject matter. The idea appalls me in fact. Some events — whether a tree in a certain light, a Mexican family looking at the movie stills outside the cinema, a dream, my own condition of being in or out of love, of some epiphany relating to husband, child, friend, cat or dog, street or painting, cloud or stone, a book read, a story heard, a life thought about, a demonstration lived through, a situation, historical and/or topical, (that’s to say known in the moment of its passing into history) — it doesn’t matter, the list is endless, but some events (selected by some interior mysterious process out of all the other minutes and hours of my life) begin to form themselves in my understanding as phrases, images, rhythms of language, demand to be further formed, demand midwifery is one way to put it. Not all that one feels most strongly makes this verbal demand, even if one is a poet — by poet here I mean prose writer too — … but whatever experiences do demand it are always strongly felt ones. That is my testimony.

She seals the sentiment with one final stab at the vanity of vacant form:

I understand that for some people something like problem-solving is in itself a stimulus — e.g. the challenge of how to tell a story as a poem, not prose, without sounding archaic or stilted, might stimulate someone to make up a story to see if it could be done. But I myself would never be interested unless I first had a story to tell.

Complement this particular portion of the wholly magnificent The Letters of Robert Duncan and Denise Levertov with T.S. Eliot on the mystical quality of creativity and Jeanette Winterson on what grants great art its power, then revisit these wonderful archival recordings of Levertov reading her poetry.

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The Boy Who Loved Math: The Illustrated Story of Eccentric Genius and Lovable Oddball Paul Erdos

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How a prodigy of primes became the Magician from Budapest before he learned how to butter his own bread.

The great Hannah Arendt called mathematics the “science par excellence, wherein the mind appears to play only with itself.” Few minds have engaged in this glorious self-play more fruitfully than the protagonist of The Boy Who Loved Math: The Improbable Life of Paul Erdős (public library) by writer Deborah Heiligman and illustrator LeUyen Pham — a wonderful addition to the most intelligent and imaginative picture-book biographies of great artists and scientists, telling the story of the eccentric Hungarian genius who went on to become one of the most prolific and influential mathematicians of the twentieth century.

Tucked into Pham’s illustrations are a number of mathematical Easter eggs, such as the palindromic primes, dihedral primes, Leyland primes, and other prime varieties — a particular obsession for Erdős — she built into her Budapest cityscape.

Erdős was born in Budapest to Jewish parents who were both math teachers. His two sisters, ages three and five, died of scarlet fever the day of his birth and his father spent the first six years of little Paul’s life as a prisoner of war in Russia. It was his mother, Anna, who nurtured the young boy’s early love of math.

Even as a toddler — or an epsilon, a very small amount in math, as he would later come to call children — he was already doing complex calculations in his head.

One day, when he was 4, Paul asked a visitor when her birthday was. She told him.

What year were you born? he asked.
She told him.

What time?
She told him.

Paul thought for a moment.
Then he told her how many seconds she had been alive.

Paul liked that trick. He did it often.

But despite — or, rather, because of — his extreme intelligence, Paul didn’t do so well in school. His intellectual vigor paralleled his bodily restlessness — he simply couldn’t sit still in the classroom.

Paul told Mama he didn’t want to go to school anymore. Not for 1 more day, for 0 days. He wished he could take days away — negative school days! He pleaded with Mama to stay home.

Luckily, mama was a worrier. She worried about germs a lot. She worried Paul could catch dangerous germs from the children at school.

Anna finally relented and Paul was entrusted in the care of the stern Fraülein. She and his mother did everything for him — they cut his meat, buttered his bread, and dressed him. But while such attentive care gave the boy room to grow his genius — we do know, after all, that parental presence rather than praise is the key to a child’s achievement — it made for substantial social awkwardness later in life.

By the time time he was twenty, he was already a world-famous mathematician, known as The Magician from Budapest — but he still lived with his mom, who still did his laundry and cooked for him and buttered his bread.

Heiligman illustrates the magnitude of his everyday incapacity with an amusing anecdote:

When Paul was 21, some mathematicians invited him to go to England to work on his math.

[…]

They all went to dinner.

Everyone else talked and ate, but Paul stared at his bread. He stared at his butter. He didn’t know how to butter his bread.

Finally he took his knife, put some butter on it, and spread it on his bread. Phew. He did it! “It wasn’t so hard,” he said.

But the buttering of the bread was merely the trigger for a larger realization — young Paul saw that the traditional path of settling down in one place, with a wife and children, working at a nine-to-five job, wasn’t the right path for him, he who longed to do math for nineteen hours a day. Heiligman writes:

Here is what he did:

Paul would get on an airplane with two small suitcases filled with everything he owned — a few clothes and some math notebooks. He might have $20 in his pocket. Or less.

He flew from New York to Indiana and to Los Angeles. He flew across the world, from Toronto to Australia.

“I have no home,” he declared. “The world is my home.”

More than half a century before Airbnb, he began staying with mathematicians all over the world, who would take him into their homes and take care of him just like his mother had. He wasn’t the easiest of house guests — he would wake up at 4 in the morning to do math, and one time he caused a colorful kitchen explosion by stabbing a carton of tomato juice with a knife, having grown impatient with figuring out how to open it properly — but his friends around the world loved him dearly for his brilliant mind and generous collaborative spirit.

Indeed, for all his eccentricity — TIME famously called him “The Oddball’s Oddball” — Erdős was no lone genius. If Voltaire was the epicenter of the famous Republic of Letters, Erdős was the epicenter of a Republic of Numbers — over the course of his long life, he collaborated with more than 500 other mathematicians and greatly enjoyed his role as what Heiligman aptly terms a “math matchmaker,” introducing peers around the world to one another so they could cooperate in moving mathematics forward. These collaborations advanced the progress of computing and paved the way for modern search engines.

He became affectionately known as Uncle Paul and mathematicians came to talk of “Erdős numbers” to measure their collaborative distance from the beloved genius in degrees of separation — those who worked with him directly earned the number 1, those who worked with someone who had worked with him directly got 2, and so forth.

Paul said he never wanted to stop doing math. And he didn’t. To stop doing math, Paul said, was to die.

So Paul left this world while he was at a math meeting.

(His famous peer John Nash — who inspired the film A Beautiful Mind, was awarded the Nobel Prize, and bore the Erdős number 3 — wasn’t so lucky.)

Complement the warm and wonderful The Boy Who Loved Math with the illustrated life-stories of other celebrated minds, including Jane Goodall, Albert Einstein, Ibn Sina, and Maria Merian. For a grownup biography of Erdős, see the excellent The Man Who Loved Only Numbers.

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