These puzzles were made as a special order from Ed Pegg Jr. to illustrate a solution to the "37 Squares" problem of fitting 37 squares of ascending size within the smallest possible square enclosure, leaving the minimum amount of gaps. Laser-cut acrylic has tinted transparent tiles within a 23" tray. It needed to be this large to make the smallest squares visible, let alone maneuverable. The schematic below shows each square with its respective size marked. This is a rare mathematical artifact and part of a hot research topic. We supply an easel or stand so you can display it as a colorful piece of art. This order page is a private address, for collectors only, with a special collectors' discount price. Compares to others of our puzzles at $195.     $165 plus $15 oversize shipping surcharge