Sometimes we actually know that the same input is perceived differently by different people. A recent famous example of this is a photograph of a dress that some people see as white and gold and other people see as black and blue. The exact same picture can result in different perceptions of color. This tells us that the qualia of color is not purely a property of the physical world. If it were, we would all say the dress has the same color. The color of the dress is a property of our brain’s model of the world. If two people perceive the same input differently, that tells us their model is
...more
