Pi city map representation, illustration. This image is composed of 36 digits of Pi arranged on a 6x6 grid. Road patches are sampled from 10 different cities - each digit is assigned a different city. The digit-to-city assignments are: 0:Berlin, 1:Cairo, 2:Hong Kong, 3:London, 4:Moscow, 5:New York, 6:Paris, 7:Rome, 8:Sydney and 9:Tokyo. 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. |