MARTIN KRZYWINSKI / JAKE LEVER / SCIENCE PHOTO LIBRARY MARTIN KRZYWINSKI / JAKE LEVER / SCIENCE PHOTO LIBRARY
Pi city map representation, illustration. This image is composed of horizontal arrangements of patches of roads sampled from ten cities. The order of the patches is determined by the digits of Pi, which are used to select regions of specific density of roads. The patch for the digit "1" has a few roads and the patch for "9" is the most dense. Pi (the sixteenth letter of the Greek alphabet) is the symbol used in mathematics to represent the constant of the ratio of the circumference of a circle to its diameter. The 3rd March is celebrated at Pi Day, the date corresponding to the first three digits of Pi (3.14) when using US calendar notation.
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