It’s super common because it’s what happens when you have exponential growth with discrete things.
Exponential growth is when the amount you gain depends on the amount you have. Just like multiplying cells…the more cells that are reproducing, the faster you grow.
But you can’t have half a cell…the integer version of exponential growth, which is basically all cell division or any kind of replication of discrete units, is the Fibonacci sequence. If it shows up in a spiral structure, which is super common for anything that grows attached to its predecessor like shells or flowers, you get a Fibonacci spiral.
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