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I guess this is a little late, but maybe better late than never....

But I was thinking about how, maybe the convention of us all seeing the same object is the same as the convention of naming something? Or perhaps a better analogy, the naming of colors.

I've always thought about people who are colorblind in this way. Say someone sees the color green as blue instead. but if he grow up being told "the grass is green" or "that crayon is green" or "the shirt you are wearing now is green", would he be able to identify them all as green, regardless of whether or not the signal is being interpreted by his brain as my version of green? How do we know that my version of purple and your version of purple are the same thing? We've both been told that the same crayon goes by the name of "purple" all our lives, but maybe your brain interprets your version of purple to be something much closer to my version of orange?

Am I making sense? Or perhaps just rambling. It's just a thought I've thought on occasion..