This soma cube contains seven pieces, which can be manipulated to make a cube in 240 ways. Additional shapes can be made, too. invented by Danish mathematician Piet Hein in 1936. Instruction sheet provided. Measures three inches square. Our cubes are laser engraved with The Thoreau Society cabin logo on one wood side. Wood grains and colors may vary. Measures about 3.75 x 4 inches. From our friends at Creative Crafthouse.