Rule 110 demos already exist but I think Turing machines are more fun! Explanation of how it works: <a href="https://github.com/brandondong/css-turing-machine/blob/master/README.md#how-does-it-work">https://github.com/brandondong/css-turing-machine/blob/maste...</a><p>(I actually made this a few years ago but the approach was flawed. Only recently got around to rewriting it.)