Abelian sandpile model (en.wikipedia.org)

...as mentioned over here:

https://news.ycombinator.com/item?id=17886529

Great article on sandpiles, http://nautil.us/issue/23/dominoes/the-amazing-autotuning-sa...

Things like this make me wish I'd gone into math or physics instead.

Also on numberphile: https://youtu.be/1MtEUErz7Gg

I wrote a Javascript visualization of this (using React) some time ago:

http://mperdikeas.github.io/stack-piling-and-tumbling/index....

(click "start dropping grain" to start)

Github repo: https://github.com/mperdikeas/js-react-stack-piling-and-tumb...