No, I`m sorry , I guess I tend to become a little bitt to abstract that sometimes I don`t understand myself what I`m saying I`ll try to say it again : we have the body and the mind . In our mind we know that one thing is green , we had learned that in school , in our family and so on . When I talked about the body I meant the organic , physical side and how it respondes to the stimulating factors , one could be the light . Ok next time I`ll think at something more practical for an explanation , promise!