Colour relationalism tells us that colours are relations between perceivers and the objects that they perceive. (This gets a bit tricky of course if what they perceive is a colour, because then what they perceive is a relation between themselves and a relation between themselves and a colour, or rather, a relation between themselves and a relation between themselves and a relation between themselves and a colour.) "Colour phenomenology" doesn't mean an awful lot: just the (apparently) obvious facts about colour and classifications of things having to do with colour based on these facts. Phenomenology in this sense has seemed to oppose colour relationalism. We don't seem to see relations between ourselves and tomatoes when we see red tomatoes. What we see is a property flattened on to the surface of the tomato! So colour relationalists have to work a bit to square their view with the phenomenology. Without meaning to be rude, might I inquire whether this is an essay topic you have been set? Why are you interested in this question at all if the works you have read are not user-friendly? I mean why are you interested in the question if you don't know what it means?
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About philosophy of color: It's very interesting but I'm having trouble understanding it because most of the works I encountered aren't "beginner-friendly". My question is, what exactly is color relationalism and what does this have to do with phenomenology? Thank you!