"Toads and Tessellations", by Sharon Morrisette.

A tale set in Renaissance Italy that demonstrates the concept of repeat patterns, or tessellations, through a little mathematical magic. With a lot of fun and chaos, Enzo and Aida help shoemaker Tessel figure out how to create 12 pairs of shoes for the dancing Princesses.

The illustrations provide many tesselation patterns in tiles, clothing, windows, etc. Charlesbridge 2012