"How significant is the enormous heightening, under mescalin, of the perception of color! ... Man's highly developed color sense is a biological luxury—inestimably precious to him as an intellectual and spiritual being, but unnecessary to his survival as an animal. ... Mescalin raises all colors to a higher power and makes the percipient aware of innumerable fine shades of difference, to which, at ordinary times, he is completely blind. It would seem that, for Mind at Large, the so-called secondary characters of things are primary."