Two Stewart Coffin classics here. The Convolution and the improvement on the Involution, the Involute. The Convolution was one of the first puzzles I ever made and consequently, it is a favorite of mine. I think it will be a favorite of yours too. Stewart's genius in creating this puzzle is obvious. Symmetry, sequential assembly, different pieces, all come together in a perfect puzzle. Along with the Involute, which changes the whole approach to the puzzle, and makes for a great pairing! These were made with the same wood, but, complimentary usage. Ships assembled or disassembled, let me know your preference.