You are probably familiar with Conway's Game of Life, one of the first computer simulations / games / screensavers ever. I am not sure if that's still true today but when I began programming, Life was something EVERYONE played with during their first stages of computer literacy.
It's nice to see that Life enthusiasts are still thriving and coming up with new algorithms that allow them to generate thousands of generations of thousands of Life cells on infinite playfield with lightning speed. This is something very different from running Life on 20x20 grid and it allows you to discover all kinds of beautiful stuff you never knew existed in Life. Download Golly multiplatform Life simulator to try it out.