Glider trails (Conway’s Game of Life)

Image 1: A 3D-printed version based on this thing that you can download and print! (image by Berend) 

Image 2: Source: http://en.wikipedia.org/wiki/Glider_(Conway’s_Life)

Caption: “A three-dimensional view of a glider, with previous generations visible going down the z-axis. The c/4 period is clearly visible as “stacks” of cells that remain alive for successive generations.” (cc-by-sa)