spiral

"...when one observes the heads of sunflowers, one notices two series of curves, one winding in one sense and one in another; the number of spirals not being the same in each sense. Why is the number of spirals in general either 21 and 34, either 34 and 55, either 55 and 89, or 89 and 144? Are these numbers the product of chance? No! They all belong to the Fibonacci sequence: 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, etc. (where each number is obtained from the sum of the two preceding)."

© Mathematics and Knots, U.C.N.W.,Bangor, 1996 - 2002

"The spiral shows up often in nature - in hurricanes and tornados, in the pattern of seeds in a sunflower, in the growing tips of ferns, in the pattern that leaves grow on a stem, in the shape of a nautilus shell, and, as a helix, the shape of the DNA molecule. The spiral is the journey of life."

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