Not only do his varied puzzle box designs show his math background, but they are all made entirely of wood. There are no nails or fasteners; just intricately-fitted wood and some glue. There’s a ...

The face puzzle, a box of wooden jigsaw pieces, looks like a child’s game, a primitive, flattened-out version of Mr. Potato Head. Start with the biggest piece, a half-inch-thick hunk of wood ...