4408. That there is a correspondence of the sight of the eye with intellectual sight, plainly appears to those who reflect; for the objects of the world, all of which derive something from the light of the sun, enter through the eye, and bestow themselves in the memory, and this evidently under a like visual figure, for whatever is produced therefrom is seen inwardly. This is the source of man's imagination, the ideas of which are called by philosophers material ideas. When these objects appear still more interiorly they present thought, and this also under some visual figure, but more pure, the ideas of which are called immaterial, and also intellectual. That there is an interior light, in which there is life, and consequently intelligence and wisdom, and that this light illumines the interior sight, and meets the things which have entered in through the external sight, is very evident; and also that the interior light operates according to the disposition of the things present there from the light of the world. The things that enter through the hearing are also inwardly turned into forms like those of the visual images that come from the light of the world.