The eye owes its existence to the light. Out of indifferent animal organs the light produces an organ to correspond to itself; and so the eye is formed by the light, for the light so that the inner light may meet the outer... If the eye were not sunlike, how could we perceive the light?
Johann Wolfgang von Goethe, Zur Farbenlehre (1810) in Goethes Werke, Hamburger Ausgabe (1982) Vol. 13, ed. Erich Trunz, Tr. Arthur Zajonc, in Catching the Light (1993) p. 184.