My question regards the existence and location of non-material entities. An idea exists? color exists? When we open our brain, all we see is neurons/cells, etc. Using a scientific aproach, we can say that color, sound, taste (etc) don't have physical existence - that is well known. If all we can see is neurons connecting, where these kind of entities exist/happen?. By a scientific point of view all entities must have matter and have a location, or not? I'm particulary interested in the location is space of those entities I mentioned. Someone could say ''The are non-material entities'' and the problem would be solved. Also, I'm assuming things that probably no scientist agrees. I don't hope a conclusive answer, I just want some ideas.