# The Elegant Mathematics of Vitruvian Man, Leonardo da Vinci’s Most Famous Drawing: An Animated Introduction

Nearly 500 years after his death, we still admire Leonardo da Vinci's many and varied accomplishments in painting, sculpture, architecture, science, and quite a few other fields besides, most of which would have begun with his putting down some part of the formidable contents of his head on to a piece of paper. (As we've seen, sometimes he needed to draw up a to-do list first.) Some of those works remained on paper, and even became famous in that humble form. If you've only seen one of Leonardo's drawings, for instance, it's almost certainly Vitruvian Man.

Leonardo's circa-1490 study of the proportions of the human body — or to put it in more common terms, the picture of the naked fellow standing inside a square and a circle — stands at an intersection of art and mathematics, one at which Leonardo spent a great deal of time throughout his life. The Ted-ED lesson above, written by educator James Earle, gets into "the geometric, religious and philosophical significance of this deceptively simple drawing" whose title references the first-century BCE Roman architect and civil engineer Marcus Vitruvius Pollio, who claimed that "the navel is the center of the human body, and that if one takes a compass and places the fixed point on the navel, a circle can be drawn perfectly around the body."

Vitruvius also realized that "arm span and height have a nearly perfect correspondence in the human body, thus placing the body perfectly inside a square as well." Both he and Leonardo saw real implications in this alignment between anatomy and geography, beginning with the notion that buildings and other works of man should also take on these "perfect" proportions. All of this ties in with the problem, first proposed by ancient geometers, of "squaring the circle," that is, finding a procedure to hand-draw a square and a circle both of equal area. Leonardo used Vitruvian Man to point toward one possible solution using the human body.

You can learn more about the importance and legacy of the drawing in the BBC documentary The Beauty of Diagrams, available on Youtube (part one, part two). "Although the diagram doesn't represent some huge scientific breakthrough," says its host, mathematician Marcus du Sautoy, "it captures an idea: that mathematics underpins both nature and the manmade world. It represents a synthesis of architecture, anatomy, and geometry. But it's the perfection and elegance of Leonardo's solution to this riddle of the square and the circle in Vitruvius which gives the diagram its power and its beauty." And judging by the unabated popularity of Vitruvian Man parodies, it looks to have at least another half-millennium of relevance ahead.

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Based in Seoul, Colin Marshall writes and broadcasts on cities and culture. His projects include the book The Stateless City: a Walk through 21st-Century Los Angeles and the video series The City in Cinema. Follow him on Twitter at @colinmarshall or on Facebook.

# John Coltrane Draws a Mysterious Diagram Illustrating the Mathematical & Mystical Qualities of Music

In a post earlier this year, we wrote about a drawing John Coltrane gave his friend and mentor Yusef Lateef, who reproduced it in his book Repository of Scales and Melodic Patterns. The strange diagram contains the easily recognizable circle of fifths (or circle of fourths), but it illustrates a much more sophisticated scheme than basic major scale theory. Just exactly what that is, however, remains a mystery. Like every mystical explorer, the work Coltrane left behind asks us to expand our consciousness beyond its narrow boundaries. The diagram may well show a series of  “multiplicities,” as saxophonist Ed Jones writes. From the way Coltrane has “grouped certain pitches,” writes vibes player Corey Mwamba, “it’s easy to infer that Coltrane is displaying a form of chromatic modulation.” These observations, however, fail to explain why he would need such a chart. “The diagram,” writes Mwamba, “may have a theoretical basis beyond that.” But does anyone know what that is?

Perhaps Coltrane cleared certain things up with his “corrected” version of the tone circle, above, which Lateef also reprinted. From this—as pianist Matt Ratcliffe found—one can derive Giant Steps, as well as “the Star of David or the Seal of Solomon, very powerful symbolism especially to ancient knowledge and the Afrocentric and eventually cosmic consciousness direction in which Coltrane would ultimately lead on to with A Love Supreme.”

Sound too far out? On the other side of the epistemological spectrum, we have physicist and sax player Stephon Alexander, who writes in his book The Jazz of Physics that “the same geometric principle that motivated Einstein’s theory was reflected in Coltrane’s diagram.” Likewise, saxophonist Roel Hollander sees in the tone circle a number of mathematical principles. But, remaining true to Coltrane’s synthesis of spirituality and science, he also reads its geometry according to sacred symbolism.

In a detailed exploration of the math in Coltrane’s music, Hollander writes, “all tonics of the chords used in ‘Giant Steps’ can be found back at the Circle of Fifths/Fourths within 2 of the 4 augmented triads within the octave.” Examining these interlocking shapes shows us a hexagram, or Star of David, with the third triad suggesting a three-dimensional figure, a “star tetrahedron,” adds Hollander, “also known as ‘Merkaba,” which means “light-spirit-body” and represents “the innermost law of the physical world.” Do we actually find such heavy mystical architecture in the Coltrane Circle?—a “’divine light vehicle’ allegedly used by ascended masters to connect with and reach those in tune with the higher realms, the spirit/body surrounded by counter-rotating fields of light (wheels within wheels)”?

As the occult/magical/Kabbalist associations within the circle increase—the numerology, divine geometry, etc.—we can begin to feel like Tarot readers, joining a collection of random symbolic systems together to produce the results we like best. “That the diagram has to do with something,” writes Mwamba, “is not in doubt: what it has to do with a particular song is unclear.” After four posts in which he dissects both versions of the circle and ponders over the pieces, Mwanda still cannot definitively decide. “To ‘have an answer,’” he writes, “is to directly interpret the diagram from your own viewpoint: there’s a chance that what you think is what John Coltrane thought, but there’s every chance that it is not what he thought.” There’s also the possibility no one can think what Coltrane thought.

The circle contains Coltrane’s musical experiments, yet cannot be explained by them; it hints at theoretical physics and the geometry of musical composition, while also making heavy allusion to mystical and religious symbolism. The musical relationships it constructs seem evident to those with a firm grasp of theory; yet its strange intricacies may be puzzled over forever. “Coltrane’s circle,” writes Faena Aleph, is a “mandala,” expressing “precisely what is, at once, both paradoxical and obvious.” Ultimately, Mwamba concludes in his series on the diagram, "it isn't possible to say that Coltrane used the diagram at all; but exploring it in relation to what he was saying at the time has led to more understanding and appreciation of his music and life."

The circle, that is, works like a key with which we might unlock some of the mysteries of Coltrane's later compositions. But we may never fully grasp its true nature and purpose. Whatever they were, Coltrane never said. But he did believe, as he tells Frank Kofsky in the 1966 interview above, in music's ability to contain all things, spiritual, physical, and otherwise. "Music," he says, "being an expression of the human heart, or of the human being itself, does express just what is happening. The whole of human experience at that particular time is being expressed."

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The History of Spiritual Jazz: Hear a Transcendent 12-Hour Mix Featuring John Coltrane, Sun Ra, Herbie Hancock & More

Josh Jones is a writer and musician based in Durham, NC. Follow him at @jdmagness

# The Famously Controversial “Monty Hall Problem” Explained: A Classic Brain Teaser

When the news broke last week of the death of game-show host Monty Hall, even those of us who couldn't quite put a face to the name felt the ring of recognition from the name itself. Hall became famous on the long-running game show Let's Make a Deal, whose best-known segment "Big Deal of the Day" had him commanding his players to choose one of three numbered doors, each of which concealed a prize of unknown desirability. It put not just phrases like "door number three" into the English lexicon but contributed to the world of stumpers the Monty Hall Problem, the brain-teaser based on the much-contested probability behind which door a contestant should choose.

Let's Make a Deal premiered in 1963, but only in 1990, when Marilyn vos Savant wrote one of her Q&A columns about it in Parade magazine, did the Monty Hall Problem draw serious, frustrated public attention.

"Behind one door is a car; behind the others, goats," went the question, setting up a Let's Make a Deal-like scenario. "You pick a door, say No. 1, and the host, who knows what's behind the doors, opens another door, say No. 3, which has a goat. He then says to you, 'Do you want to pick door No. 2?' Is it to your advantage to switch your choice?" Yes, replied the unhesitating Savant and her Guinness World Record-setting IQ, you should switch. "The first door has a 1/3 chance of winning, but the second door has a 2/3 chance."

This logic, which you can see broken down by University of California, Berkeley statistics professor Lisa Goldberg in the Numberphile video at the top of the post, drew about 10,000 letters of disagreement in total, many from academics at respectable institutions. Michael Shermer received a similarly vehement response when he addressed the issue in Scientific American eighteen years later. "At the beginning of the game you have a 1/3rd chance of picking the car and a 2/3rds chance of picking a goat," he explained. "Switching doors is bad only if you initially chose the car, which happens only 1/3rd of the time. Switching doors is good if you initially chose a goat, which happens 2/3rds of the time." Thus the odds of winning by switching becomes two out of three, double those of not switching.

Useful advice, presuming you'd prefer a Bricklin SV-1 or an Opel Manta to a goat, and that the host opens one of the unselected doors every time without fail, which Hall didn't actually do. When he did open it, he later explained, the contestants made the same assumption many of Savant and Shermer's complainants did: "They'd think the odds on their door had now gone up to 1 in 2, so they hated to give up the door no matter how much money I offered. By opening that door we were applying pressure." Ultimately, "if the host is required to open a door all the time and offer you a switch, then you should take the switch. But if he has the choice whether to allow a switch or not, beware. Caveat emptor. It all depends on his mood" — a rare consideration in anything related to mathematics, but when dealing with the Monty Hall problem, one ignores at one's peril the words of Monty Hall.

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Based in Seoul, Colin Marshall writes and broadcasts on cities and culture. His projects include the book The Stateless City: a Walk through 21st-Century Los Angeles and the video series The City in Cinema. Follow him on Twitter at @colinmarshall or on Facebook.

# The Complex Geometry of Islamic Art & Design: A Short Introduction

When you think of the accomplishments of the Islamic world, what comes to mind? For most of this century so far, at least in the West, the very notion has had associations in many minds with not creation but destruction. In 2002, mathematician Keith Devlin lamented how "the word Islam conjures up images of fanatical terrorists flying jet airplanes full of people into buildings full of even more people" and "the word Baghdad brings to mind the unscrupulous and decidedly evil dictator Saddam Hussein." Ironically, writes Devlin, "the culture that these fanatics claim to represent when they set about trying to destroy the modern world of science and technology was in fact the cradle in which that tradition was nurtured. As mathematicians, we are all children of Islam."

You don't have to dig deep into history to discover the connection between Islam and mathematics; you can simply see it. "In Islamic culture, geometry is everywhere," says the narrator of the brief TED-Ed lesson above. "You can find it in mosques, madrasas, palaces, and private homes."

Scripted by writer and consultant on Islamic design Eric Broug, the video breaks down the complex, abstract geometric patterns found everywhere in Islamic art and design, from its "intricate floral motifs adorning carpets and textiles to patterns of tilework that seem to repeat infinitely, inspiring wonder and contemplation of eternal order."

And the tools used to render these visions of eternity? Nothing more advanced than a compass and a ruler, Broug explains, used to first draw a circle, divide that circle up, draw lines to construct repeating shapes like petals or stars, and keep intact the grid underlying the whole pattern. The process of repeating a geometric pattern on a grid, called tessellation, may seen familiar indeed to fans of the mathematically minded artist M.C. Escher, who used the very same process to demonstrate what wondrous artistic results can emerge from the use of simple basic patterns. In fact, Escher's Dutch countryman Broug once wrote an essay on the connections between his art and that of the Islamic world for the exhibit Escher Meets Islamic Art at Amsterdam's Tropen­mu­seum.

Escher first encountered tessellations on a trip to the Islamic world himself, in the "colorful abstract decorations in the 14th century Alhambra, the well-known palace and fortress complex in Southern Spain," writes Al.Arte's Aya Johanna Daniëlle Dürst Britt. "Although he visited the Alhambra in 1922 after his graduation as a graphic artist, he was already interested in geometry, symmetry and tessellations for some years." His fascinations included "the effect of color on the visual perspective, causing some motifs to seem infinite — an effect partly caused by symmetry." His second visit to Alhambra, in 1936, solidified his understanding of the principles of tessellation, and he would go on to base about a hundred of his own pieces on the patterns he saw there. Those who seek the door to infinity understand that any tradition may hold the keys.

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Based in Seoul, Colin Marshall writes and broadcasts on cities and culture. He’s at work on the book The Stateless City: a Walk through 21st-Century Los Angeles, the video series The City in Cinema, the crowdfunded journalism project Where Is the City of the Future?, and the Los Angeles Review of Books’ Korea Blog. Follow him on Twitter at @colinmarshall or on Facebook.

# Trigonometry Discovered on a 3700-Year-Old Ancient Babylonian Tablet

One presumption of television shows like Ancient Aliens and books like Chariots of the Gods is that ancient people—particularly non-western people—couldn’t possibly have constructed the elaborate infrastructure and monumental architecture and statuary they did without the help of extra-terrestrials. The idea is intriguing, giving us the hugely ambitious sci-fi fantasies woven into Ridley Scott’s revived Alien franchise. It is also insulting in its level of disbelief about the capabilities of ancient Egyptians, Mesopotamians, South Americans, South Sea Islanders, etc.

We assume the Greeks perfected geometry, for example, and refer to the Pythagorean theorem, although this principle was probably well-known to ancient Indians. Since at least the 1940s, mathematicians have also known that the “Pythagorean triples”—integer solutions to the theorem—appeared 1000 years before Pythagoras on a Babylonian tablet called Plimpton 322. Dating back to sometime between 1822 and 1762 B.C. and discovered in southern Iraq in the early 1900s, the tablet has recently been re-examined by mathematicians Daniel Mansfield and Norman Wildberger of Australia’s University of New South Wales and found to contain even more ancient mathematical wisdom, “a trigonometric table, which is 3,000 years ahead of its time.”

In a paper published in Historia Mathematica the two conclude that Plimpton 322’s Babylonian creators detailed a “novel kind of trigonometry,” 1000 years before Pythagoras and Greek astronomer Hipparchus, who has typically received credit for trigonometry’s discovery. In the video above, Mansfield introduces the unique properties of this “scientific marvel of the ancient world," an enigma that has “puzzled mathematicians,” he writes in his article, “for more than 70 years.” Mansfield is confident that his research will fundamentally change the way we understand scientific history. He may be overly optimistic about the cultural forces that shape historical narratives, and he is not without his scholarly critics either.

Eleanor Robson, an expert on Mesopotamia at University College London has not published a formal critique, but she did take to Twitter to register her dissent, writing, “for any historical document, you need to be able to read the language & know the historical context to make sense of it. Maths is no exception.” The trigonometry hypothesis, she writes in a follow-up tweet, is “tediously wrong.” Mansfield and Wildberger may not be experts in ancient Mesopotamian language and culture, it's true, but Robson is also not a mathematician. “The strongest argument” in the Australian researchers’ favor, writes Kenneth Chang at The New York Times, is that “the table works for trigonomic calculations.” As Mansfield says, “you don’t make a trigonomic table by accident.”

Plimpton 322 uses ratios rather than angles and circles. “But when you arrange it such a way so that you can use any known ratio of a triangle to find the other side of a triangle,” says Mansfield, “then it becomes trigonometry. That’s what we can use this fragment for.” As for what the ancient Babylonians used it for, we can only speculate. Robson and others have proposed that the tablet was a teaching guide. Mansfield believes “Plimpton 322 was a powerful tool that could have been used for surveying fields or making architectural calculations to build palaces, temples or step pyramids.”

Whatever its ancient use, Mansfield thinks the tablet “has great relevance for our modern world… practical applications in surveying, computer graphics and education.” Given the possibilities, Plimpton 322 might serve as “a rare example of the ancient world teaching us something new,” should we choose to learn it. That knowledge probably did not originate in outer space.

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Josh Jones is a writer and musician based in Durham, NC. Follow him at @jdmagness

# Arnold Schoenberg Creates a Hand-Drawn, Paper-Cut “Wheel Chart” to Visualize His 12-Tone Technique

"These go up to eleven," Spinal Tap famously said of the amplifiers that, so they claimed, took them to a higher level in rock music. But the work of Austrian composer Arnold Schoenberg, one of the best-known figures in the history of avant-garde music, went up to twelve — twelve tones, that is. His "twelve-tone technique," invented in the early 1920s and for the next few decades used mostly by he and his colleagues in the Second Viennese School such as Alban Berg, Anton Webern, and Hanns Eisler, allowed composers to break free of the traditional Western system of keys that limited the notes available for use in a piece, instead granting each note the same weight and making none of them central.

This doesn't mean that composers using Schoenberg's twelve-tone technique could just use notes at random in complete atonality, but that a new set of considerations would organize them. "He believed that a single tonality could include all twelve notes of the chromatic scale," writes Bradford Bailey at The Hum, "as long as they were properly organized to be subordinate to tonic (the tonic is the pitch upon which all others are referenced, in other words the root or axis around which a piece is built)." The mathematical rigor underlying it all required some explanation, and often mathematical and musical concepts — mathematics and music being in any case intimately connected — become much clearer when rendered visually.

Hence Schoenberg's twelve-tone wheel chart pictured at the top of the post, one of what Arnold Schoenberg's Journey author Allen Shawn describes as "no fewer than twenty-two different kinds of contraptions" — including "charts, cylinders, booklets, slide rules" — "for transposing and deriving twelve-tone rows" needed to compose twelve-tone music. (See the slide ruler above too.) "The distinction between 'play' and 'work' is already hard to draw in the case of artists," writes Shawn, "but in Schoenberg's case it is especially hard to make since he brought discipline, originality, and playfulness to many of his activities." These also included making special playing cards (two of whose sets you can see here and here) and even his own version of chess.

As Shawn describes it, Koalitionsscach, or "Coalition Chess," involves "the armies of four countries arrayed on the four sides of the board, for which he designed and constructed the pieces himself." Instead of an eight-by-eight board, Coalition Chess uses a ten-by-ten, and the pieces on it "represent machine guns, artillery, airplanes, submarines, tanks, and other instruments of war." The rules, which "require that the four players form alliances at the outset," add at least a dimension to the age-old standard game of chess — a form that, like traditional Western music, humanity will still be struggling to master decades and even centuries hence. But apparently, for a mind like Schoenberg's, chess and music as he knew them weren't nearly challenging enough.

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Based in Seoul, Colin Marshall writes and broadcasts on cities and culture. He’s at work on the book The Stateless City: a Walk through 21st-Century Los Angeles, the video series The City in Cinema, the crowdfunded journalism project Where Is the City of the Future?, and the Los Angeles Review of Books’ Korea Blog. Follow him on Twitter at @colinmarshall or on Facebook.

# John Coltrane Draws a Picture Illustrating the Mathematics of Music

Physicist and saxophonist Stephon Alexander has argued in his many public lectures and his book The Jazz of Physics that Albert Einstein and John Coltrane had quite a lot in common. Alexander in particular draws our attention to the so-called “Coltrane circle,” which resembles what any musician will recognize as the “Circle of Fifths,” but incorporates Coltrane’s own innovations. Coltrane gave the drawing to saxophonist and professor Yusef Lateef in 1967, who included it in his seminal text, Repository of Scales and Melodic Patterns. Where Lateef, as he writes in his autobiography, sees Coltrane's music as a "spiritual journey" that "embraced the concerns of a rich tradition of autophysiopsychic music," Alexander sees “the same geometric principle that motivated Einstein’s" quantum theory.

Neither description seems out of place. Musician and blogger Roel Hollander notes, “Thelonious Monk once said ‘All musicans are subconsciously mathematicians.’ Musicians like John Coltrane though have been very much aware of the mathematics of music and consciously applied it to his works.”

Coltrane was also very much aware of Einstein’s work and liked to talk about it frequently. Musican David Amram remembers the Giant Steps genius telling him he “was trying to do something like that in music.”

Hollander carefully dissects Coltrane's mathematics in two theory-heavy essays, one generally on Coltrane’s “Music & Geometry” and one specifically on his “Tone Circle.” Coltrane himself had little to say publically about the intensive theoretical work behind his most famous compositions, probably because he’d rather they speak for themselves. He preferred to express himself philosophically and mystically, drawing equally on his fascination with science and with spiritual traditions of all kinds. Coltrane’s poetic way of speaking has left his musical interpreters with a wide variety of ways to look at his Circle, as jazz musician Corey Mwamba discovered when he informally polled several other players on Facebook. Clarinetist Arun Ghosh, for example, saw in Coltrane's "mathematical principles" a "musical system that connected with The Divine." It's a system, he opined, that "feels quite Islamic to me."

Lateef agreed, and there may be few who understood Coltrane’s method better than he did. He studied closely with Coltrane for years, and has been remembered since his death in 2013 as a peer and even a mentor, especially in his ecumenical embrace of theory and music from around the world. Lateef even argued that Coltrane's late-in-life masterpiece A Love Supreme might have been titled "Allah Supreme" were it not for fear of "political backlash." Some may find the claim tendentious, but what we see in the wide range of responses to Coltrane's musical theory, so well encapsulated in the drawing above, is that his recognition, as Lateef writes, of the "structures of music" was as much for him about scientific discovery as it was religious experience. Both for him were intuitive processes that "came into existence," writes Lateef, "in the mind of the musican through abstraction from experience."

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Josh Jones is a writer and musician based in Durham, NC. Follow him at @jdmagness

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