But what if your senses fail you? It is the same concept as a color blind man, if nobody ever told him that the world is colorful, what he sees in black and white is the reality. What's more, even if someone were to tell him that the world is colorful, he would never be able to picture what it is like?

Come to think of it, what we see in this color of the world may not be real even. Maybe seeing in colorful is a defect itself?