Architect Hideyuki Nakayama designed a globular glass door knob that lets people look through it into the next room. There are three more pictures at the link illustrating how it works.
Link via Gizmodo | Designer's Website | Photo: Spoon & Tamago
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Not exactly private. Whoever's inside can see back at you, can't they?
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My doorknob already reveals rooms. Just turn it and pull.
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