When the grid points in MirrorMirror are moved by distances greater than the original distances between them then the shading rules break down. Forms such as those shown here appear. The program was altered to put two such forms facing each other. A separate piece of code composed a background having the suggestion of a skyline and other features of a landscape. Each run of the program gives a different graphic of the same type.

http://www.bridgesmathart.org/art-exhibits/bridges2008/sutcliffeA.html