I remember programming Conway’s game of life on my C64 after reading about the idea in a library of the Cycle d’Orientation (Geneva’s equivalent for junior high-school). The book contained some code expressed in a variant of Basic that was pretty different from the C64’s, so some serious adaptation was needed. I ended up staring at the patterns for some time.
Bill Gosper’s Glider Gun in action—a variation of Conway’s Game of Life. CC BY-SA 3.0