Fibonacci number - Wikipedia, the free encyclopedia.Yellow Chamomile head showing the arrangement in 21 (blue) and 13 (aqua) spirals. Such arrangements involving consecutive Fibonacci numbers appear in a wide variety of plants.
What makes the tiny snail shell so beautiful? Why does that shape occur in nature over and over again—in rushing rivers, in a flower bud, even inside your ear? ~ Swirl by Swirl: Spirals in Nature - Joyce Sidman, Beth Krommes