[Kagen Sound] is a woodworker and artist who gives a great behind-the-scenes look at his amazingly high-quality puzzle boxes (video). Not only do his varied puzzle box designs show his math background, but they are all made entirely of wood. There are no nails or fasteners; just intricately-fitted wood and some glue.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/01/30/design-secrets-of-fantastic-hand-made-puzzle-boxes/