Simplicity and symmetry make this geometric puzzle a classic. The pyramid is a shape that has fascinated humans since the dawn of mathematics. This tabletop version consists of 20 identical wooden balls arranged in six separate pieces. The goal of the puzzle is to arrange the pieces into a pyramid, of course. Easier than Piet Hein's original configuration but more difficult than our Two-Piece Pyramid Puzzle, the Pyramid of Balls is solve-able for beginners but holds a tactile appeal for advanced puzzlers as well. Measures approximately 2.5" tall once assembled.