So far, I did understood things, these are all under natural circumstances. So, taking apple example forward what if I project green or blue light on it? It won't be showing red colour then. Or atleast not the same way. Now that incident light has changed so the internal molecules or atomic system like electrons jumping form one state to other..etc will also change depending upon the energy it gets and time it takes to dissipate. All the physics I get it but it is too limited I think. Because it is with respect to ours.

Now do the same experiment with animals, their perception of colours is vastly different. So, for them also things are happening the same way like for us, but it is possible that they perceive and their perception of colours are much stronger or weaker than us. Or take people who are colour blind.