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We redesign the "Beware of slippery" sign by changing the shape from the original round to a cold metal one and the color from yellow to dark colors. Color psychology shows that metal texture and dark colors can give people an uncomfortable psychological feeling, There are sensing and projection devices at the top of the sign which can send out red light to mark the wet area. The intensity of red light will be weakened when the floor is less and less moist so people will see clearly where is already dry and avoid the wet area. This will not only prevent unexpected accidents but also ease off unnecessary work for cleaners.