The Pennyhedron puzzle was designed by Stewart Coffin, with some help and inspiration from his children. As the story goes, his kids used to glue puzzle blocks together in his shop which inspired him in the direction of the Pennyhedron. This is a clever puzzle with only 2 pieces, which he and his children used to sell with a penny inside hence the name.
This is an interesting puzzle. The object is to extract the ball by navigating a hidden internal 3D maze. This puzzle is a discontinued Orb Factory item.