Our current background image is “Penrose Substitution” by Jared Tarbell. Tarbell is a generative artist who explores the life-like emergent qualities of generative systems. From his site, Infinite.center:

This sketch uses a tile substitution method for constructing highly ordered aperiodic tilings. Each construction is made entirely from just two basic shapes. The shapes are triangles. Commonly called the ‘half-kite’ and ‘half-dart’ , they are derived from the pentagon and described in depth by Roger Penrose.

More images at Infinite.center.