ayesha.a
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Not "prove", but you can demonstrate. Take two objects identical in all respects, except their color. Say, a blue cube and a red cube. Have him hold them in either hand of his. (ie, one in each hand.) Then close your eyes or leave the room, and give him the choice to either move the cubes from his left hand to his right and vice versa, or not move. Then walk back to him, and tell him if he has switched the cubes or not. If you can tell that correctly each time, then he will have to accept that you have a sensor that he lacks, and that there is a certain quality to be sensed - which you call color. (Since the cubes are identical in all other aspects, he cannot correctly distinguish between the cubes, but you can.)Can you scientifically prove to a blind man that color exists ?
You cannot of course make him understand what color is - just like we don't know how the world looks like in UV light, but cats do. But you can demonstrate that there is a quality that he cannot sense, but you can. You call it 'color', but any other name would do as well.