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One of the questions that this class sparked in my mind is one that I have heard before, if we all see things differently, how do we know that what one person thinks is red is the same as what another person thinks is red? Is there any way to have a standard in terms of color? Or to determine that what we see is the same?

One of my friends is a fine arts major who is currently taking a painting class, one day she said to me, "I don't see white anymore, when I look at a wall it is never just white. Everything is full of color." When I look at a white wall, I see a white wall. We both look at the same object and see different colors, a perfect example of the subjectivity of sight and how the brain processes input. Is her ability to see color in white because she has more sensitive cones in her eye, or has she just trained herself to see it because of her painting class?