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A door knob is not something, you would pay a lot of attention too but if you have a door knob that shows the room you are about to enter then I am sure a lot of us will.  Architect Hideyuki Nakayama has teamed up with UNION, a manufacturer of door handles and levers, to create a glass globe doorknob. As you approach the doorknob you catch a glimpse of  what appears to be another world, waiting for you to enter and join, but in fact is a reflection of  the room on the other side of the door.

Source: Spoon-tamago