This is indeed a possibility, and with the growing research in the field of mental studies there is more and more evidence that this could be highly possible. For the following scenario imagine that a person associates blue with sky and gray with clouds. This person wakes up and goes out to get the morning newspaper, looks up and thinks a storm is coming, because he has simply associated the blue sky with his knowledge that clouds are gray and that gray clouds probably bring rain, or vice versa, a person sees a gray sky and thinks it will be a beautiful sunny day, but a few minutes later it starts raining. A few minutes later the significant other calls her and asks about the weather, and the person says something like, “It's a beautiful blue and sunny day,” at which point the person is confused because she had associated the blue sky with rain, but it generally doesn't rain when the sky is blue. It is possible that instantly this man's color perception changed, well, according to the inverted spectrum theory; YES. So, if this is possible, the theory will challenge the idea of ​​functionalism; Functionalism is the idea that mental states are defined by what they do and not by their physical properties. Spectrum inversion