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This design——“ Light guide ” ，is the research and application of human`s instinct .When people get lost in a dark cavern , every single piece of light can be a lifesaver , because light means the right direction and the hope to get rid of the darkness .
Similarly,when you stand at the doorway of your residence but you cannot get in , only because you can`t find the keyhole in darkness . In this situation “ light guide ” shall be helpful by providing accurate position with a piece of white light shining from the keyhole.