https://en.wikipedia.org/wiki/Rule_30#Random_number_generati...
> Rule 30 generates seeming randomness despite the lack of anything that could reasonably be considered random input. Stephen Wolfram proposed using its center column as a pseudorandom number generator (PRNG); it passes many standard tests for randomness...
http://maximecb.github.io/Turing-Drawings/#5,3,3,2,3,1,2,2,1...