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UK design students Joie de Winter and Michael Leung designed the 72 degrees shelf for a very specific teenage need—the need to secret a porn stash away from the prying eyes of parents, siblings and visitors.

The shelf has a secret compartment built-in that can only be opened with a ring. Named after the average angle of a healthy erection, 72 degrees is also cleverly the angle the secret compartment opens up to.

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72 degrees [designboom]
Secret Shelf Compartment Opened Via Decoder Ring [Uber-Review]