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Hideyuki Nakayama designed these unique openers with?UNION, currently on display but soon to be manufactured and sold at retail outlets. ?The catch, of course, is that you would not want to replace every entry lever with such a device: privacy being a primary concern for front doors, bedrooms and the like.

Still, for safety reasons it might be helpful to know ahead of time what might be happening in a shared hallway or public space – essentially, these may prove to be more useful as a new form of peep hole that lets residents look out rather than giving invited (or uninvited) guests the chance to look in.