A square wheel may be the ultimate flat tire. There’s no way it can roll over a flat, smooth road without a sequence of jarring bumps. Equiangular spiral on a sawtooth road. Stan Wagon, a ...

Mr. Segerman, who lives in Manchester, England, is a maker who likes mathematical shapes; he studied fine art and now designs and manufactures escape-room puzzles.

It consists of 14 puzzle pieces that can fit together in the form of many different shapes. There are 536 different ways to fit the pieces together as a square.