Who is he? Leonardo of Pisa, mathematician, circa 1170-1240-50. In 1202 he developed a sequence that began as a solution to a problem involving mating rabbits: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, etcetera. The Fibonacci sequence is a series of numbers in which each number is the sum of the two preceding numbers. When we make squares with those widths, we get a spiral:
courtesy of mathisfun.com
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