"Democritus held that 'all knowledge is caused by images issuing from the bodies we think of and entering into our souls,' as Augustine says in his letter to Dioscorus (cxviii, 4). And Aristotle says (De Somn. et Vigil.) that Democritus held that knowledge is caused by a 'discharge of images.'" (Aquinas, ST, Q84 A6)
"No ideas but in things." (William Carlos Williams)
"We make ourselves pictures of the facts." (Ludwig Wittgenstein)
