Fractal

A fractal is generally "a rough or fragmented geometric shape that can be split into parts, each of which is (at least approximately) a reduced-size copy of the whole,"[1] a property called self-similarity. The term was coined by Benoît Mandelbrot in 1975 and was derived from the Latin fractus meaning "broken" or "fractured." A mathematical fractal is based on an equation that undergoes iteration, a form of feedback based on recursion.

The above (from Wikipedia) is more understandable then the mathematical explanation a few posts back. When reading that page it becomes clear that a fractal can be found in nature. There's something about fractals which I find intriquing. It looks pretty but the recurring geometric shapes somehow feels 'universal'. Below is a natural occuring fractal, romanesco broccoli.