Hello friends, I'm discussing here with a guy about how we see color and stuff... he claimed two suspicious things and I want to ask you If it is true and If there is evidence of what he said... claim 1 and 2... I'm talking evidence, not hypothesis...can anyone help me here? just remembering that he is not a physicist 1. objects emit or reflect a range of photon wave frequencies. The cones in our eyes receive three of these frequencies and create synapse electrochemical signals that assign colours in our heads. 2. Through evolution an arbitrary combination has evolved to form a vision of "white" in our heads. There is no such thing as "white" in the real physical world. " <- is there any evidence of this assumption ? All I know from physics is that white is objectively real, we merely perceive it, he is saying something new for me, and using philosophy, not physics.