Crystallizing water forms repeating patterns in snowflakes and on frosty surfaces. The patterns have inspired claims about the power of consciousness to affect matter, as well as one of the first described fractal curves, the Koch snowflake.
Fractal Geometry ~ A fractal is defined as 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," according to their "discoverer" Benoit Mendelbrot (Nov. 20, 1924 – Oct. 14, 2010). In plain English this means that something is "self-similar," or at least generally like a zoomed in/out iteration of itself.
Really cool fractal patterns. Fractals are shapes that are infinitely self-similar at every scale of magnification. So as you zoom in on each little squiggly arm, you realize that it also possesses its own squiggly arms that are the same shape as itself, and you can zoom inwards into infinity finding the same patterns forever.