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In the dark night, fumbling the keyhole may be difficult for people.
Just like magnets, like poles repel while unlike poles attract. We add magnets on two sides of the keyhole and keys, if like poles, it repels. Then the key can’t be inserted.
If the key is attracted in keyhole, then it’s the right side.
Southern Taiwan University of Science and Technology
Tainan, Taiwan
Southern Taiwan University of Science and Technology
Tainan, Taiwan
JUN-YI WANG
SHIUAN-KAI JU
CHUN-YI TU
DING-ZAN YANG