Convolution is an interlocking 4x4x4 cube puzzle originally designed by Stewart Coffin in 1979. This reproduction is finely crafted by hand from solid Maple, Redheart and hidden inside is Sapele. Approx 2.5” on each side. Individually handcrafted each one is a truly unique piece of art. This classic puzzle will be treasured by puzzle collectors and enthusiasts for years to come.