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Math Photo: Spiky Symmetry

These cacti caught my. I can see both a dodecagon and a star in the 12-fold symmetry of the cactus in front. And to my surprise, the cactus behind it has thirteen sections!

I wonder about the range, and deviation, of the number of sections of these cacti. And what are the biological principles that govern these mathematical characteristics?

One Comment

  1. Sheila Krilov says:

    13 is a Fibonacci number and those Fibonacci numbers keep appearing in nature. I’m more surprised by the 12.

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