Here's another beautiful bit of wooden puzzle design and craftsmanship from Denver metagrobologist Kagen Schaefer. The locking mechanism was recently reverse-engineered by Instructables user dombeef, who has made a working paper version.
Lock and unlock all the secrets of this storage unit. Inspired by the labyrinthine neighborhoods of the Kreuzberg area in Berlin, the gorgeous Secret Puzzle Box allows you to display your treasures and cherished items in plain sight. Constructed out of oak with brass locks and keys, opening each compartment is a delightful surprise each time. Made in Berlin. $6,949.