Object: Open the lock. A beautiful wooden lock that doesn't need a key to open it.  Move the metal sliders around in their grooves until you can figure out how the lock comes apart. 
This is probably the hardest version, since you are navigating a totally hidden maze!  Also available in bronze finish and transparent acrylic, both of which reveal the workings inside the inner maze.
Made in wood by Jean-Claude Constantin. Jean-Claude Constantin lives in Germany, where he designs and manufactures many different wood and metal puzzles, as well as magic tricks.

The solution is not included with this puzzle.