That is the opposite, but, equally valid, way of looking at it. The point is, however, that they are still not seeing exactly the same thing.So, if you had two people, one who looked a a flag, said it was one flag but made up of three fabrics with colors red, orange and green and another that said it was one flag and not to associate different fabrics with it, which person would you suspect is color blind and which one is not?
Even assuming normal vision, if one said that the flag is a 3'X5' sheet of fabric and another said no, the flag is a 3'x5' sheet of fabric, a 15' aluminum pole, and a rope on a pulley, which would be correctly describing the flag? Is the flag pole an essential part of a flag? What about a flag draped over a coffin, or hanging flat on the side of a building?