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The design is to solve the problem that we can't find the keyhole at the caliginous corridor. The keyhole has a ring of light belt at it periphey. This a fluorescent material about light which can persist for a long time.
It will show different light effects with different light. The darker the environment is, the brighter it is. And the key has the same color of the light with the corresponding lock. So, it is more convenient and faster for us to open the door in the evening.