double spiral pattern in sunflower

Here is a classic example of clockwise and counter-clockwise spirals. The number of each type of spiral is usually a Fibonacci number, and the 2 numbers are next to each other in the sequence 1-2-3-5-8-13-21-34-55-89-144… Sunflowers can have 34 spirals one way and 55 the other, or 55 and 89, or 89 and 144. Pine cones have 3 and 5, 5 and 8, or 8 and 13 sets of spirals. The clockwise spirals are in the pine cone picture, but not as pronounced as the counter-clockwise ones. Here both sets are equally prominent.

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