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Sarah, I think it is interesting that you bring up the apple example as it links to something that I often ponder.  Yes, we both say that the apple is red and spherical, but is my red your red?  We agree to call that color red because that is what we are taught but maybe my red looks more like what you call your green and your red look more like what I call my purple.  So then what does this mean for our perception?  Is it like Dickinson said and our perception is only in our brains, or is there something else?  As technology grows will we ever be able to know if my apple = your apple.  I guess it would be rather frightening to think that it might not as this opens up the doors for lot of other complications.  Might this explain preferences?  Why we all do not enjoy spicy food? or why your friend at the coffee shop doesn’t think that person sitting in the corner is all that cute?