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Generally people face a common problem that they do not know how to correctly identify the right direction of key rotation when opening a door.
"RED GREEN "solves this problem by visual identity. When the keyhole is vertical,
it means the door is open, and the slot around the keyhole displays green,
Horizontal means that the door is closed and the slot around the keyhole display red,
it is easy for people to recognize whether the door is open or not.
Zhe Jiang University
Ning Bo, China
Lin Lin;Peng Liu; Xuan Chen