Pythagoras is a 2-layer puzzle. It consists of 6 elements that are made up of 2 hinged triangles. The goal is to put all 6 elements into the frame so that you have a 2-layer hexagon!
Based in Munster, Germany, Siebenstein-Spiele was founded in 1992. Although the company is mainly known for board games, Siebenstein-Spiele also makes many wooden puzzles, several of which have been designed by company founder Jürgen Reiche.