Qualia

inverted qualia.jpeg
made by Was a bee.

“The inverted spectrum thought experiment, originally developed by John Locke,[8] invites us to imagine that we wake up one morning and find that for some unknown reason all the colors in the world have been inverted. Furthermore, we discover that no physical changes have occurred in our brains or bodies that would explain this phenomenon. Supporters of the existence of qualia argue that since we can imagine this happening without contradiction, it follows that we are imagining a change in a property that determines the way things look to us, but that has no physical basis.” (wiki)
More on the inverted spectrum argument here.

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