Snell's law in life a medium of a mind prism, as sure as , the wavelenths have varying temperatures: Wide open aperature of high the slitted view of depressions, purpish absorbing the green, yellow echoes, yellow absorbing the hot red rays. If only I saw what was absorbed, the waves that came I ignored. Blue with depressions, colder than all the feel of ultraviolets. Or intense as the white paper absorbing the infrared rays. I pass , like a prism, the negative refractive indexes.