"You touch him, Dan, and I'll spread it in every one of our media.
Coloured media act like filters, stopping certain kinds but allowing the rest to go through.
He gave a very accurate explanation of the action of the human eye, and made many hypotheses, some of them shrewd and close to the mark, concerning the law of refraction of light in dense media: but though several minor points of interest turned up, nothing of the first magnitude came out of this long research.