Watch What Happens When He Puts The Key In The Cabinet And Opens It.

This antique cabinet was created in the second half of the 18th century at the workshop of Abraham and David Roentgen, in the Rhine region of Germany. At its peak, the workshop employed nearly 200 highly specialized artisans and craftsmen. The workshop's ability to seamlessly incorporate intricate mechanisms into its cabinets is nothing less than extraordinary, considering that everything was made using hand tools.

As you can see, despite being over 200 years old, this cabinet's features are all still working just as smoothly as the day they were made. This particular cabinet was originally owned by King Frederick William II of Prussia, and now resides at The Metropolitan Museum of Art.
Credits: Wimp
If I had one of these I would need a map to find my way round it and a diary to indicate where I had put things. Brilliant piece of furniture.