The sunflower has two interlaced logarithmic spirals: 21 clockwise spirals and 34 counterclockwise spirals which numbers are subsequent numbers of the Fibonacci sequence! Comparable opposite arrangements of logarithmic spirals, associated with Fibonacci numbers, occur also by the daisy, the fir-apple (5 and 8) and the pineapple (8 and 13).

The number of petals in a flower is also often one of the following numbers: 3, 5, 8, 13, 21, 34 or 55. For example the lily has three petals, buttercups have five, chicory has 21, daisy has often 34 or 55 petals, et cetera.

All these numbers belong to the Fibonacci sequence: 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, … where each number is obtained from the sum of the two preceding.

Young also postulated the idea the humans progress in a spiral – that explains why we often see ourselves passing through the same point many times, wlthought in a slightly different way.