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The Colors key uses a color-matching way allowing users to quickly find out the correct key for opening the door.
The color-matching way on Colors key means the same color on the head of key and the keyhole of door. The sticker for the keyhole can be pushed out from the head of key and be stuck on the keyhole.
When the color of key matches the color of keyhole, the door can be opened easily.
The needed key can be found from a pile of keys by obviously visual color changes.
National Chiao Tung Uni, National Taipei University of Technology, Ming Chi University of Technology
National Taipei University of Technology | Ming Chi University of Technology
You Zen Chen, You-Ren Chen, Liu Rong-cheng, Chun-Chia Hsu