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  1. Internet says:

    The art of being invisible is as easy as being able to see around corners.
    Because IR lights are not visible to the naked eye they
    won’t stand out in your everyday activities. Among these are office projection clocks
    that project the time and other data onto a wall or ceiling:
    these are mainly in the form of office gadgets that are intended to look
    unique rather than serious clocks, because it is obviously more convenient
    just to check a clock that your wall or ceiling.