Operation meets lock picking
Artist Moritz Waldemeyer crafted this rather neat lockpicking variation of the game Operation: the idea is to insert the key through the translucent block, navigating the tumblers without touching the walls. I like it, but performing laproscopic surgery on the exposed bones of a bulbously nosed fat man is a bit timeless.
Keyhole Surgery [Waldemeyer via Hack A Day]

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Even when I was a kid, Operation was only fun for about 6 minutes.
The block is transparent, not translucent.