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Interesting. How do you know that the color blue you see is the same as the color blue I see? How objective is that experience, really?

If you are an objectivist, we can know that a certain color emits a certain bandwith which can be measured. If someone is totally color blind or blue-green color blind, you can determine this by the inability of the person to detect those colors. You can also ask an individual to identify a specific color and if he can, that is a good indication that we are seeing the same color. We can get into the debate over whether or not I am a butterfly dreaming that I am a human or does a tree falling in an isolated place make a sound, but I am not a non-realist. If I see a triangle, I have reason to believe that others see a triangle, too. If we are not objectivists, then it would be impossible for us to actually have a conversation. You have to assume that what you wrote is what I read. Just as I have to assume that you and I see the same color.