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My wife, sitting in the same room as me, can say "I feel cold" while I feel quite comfortable. These are two different perceptions of the same circumstance which can be noticed. But RED to me and RED to her would be different perceptions which could only be measured if I could see the RED as she see's it, so I can compare it to the RED as I see it.
Please explain how you might swap two peoples' experience in order to find out if they perceived it in the same way.