"The moment our discourse rises above the ground-line of familiar facts, and is inflamed with passion or exalted thought, it clothes itself in images. A man conversing in earnest, if he watch his intellectual processes, will find that always a material image, more or less luminous, arises in his mind, contemporaneous with every thought, which furnishes the vestment of the thought.... This imagery is spontaneous. It is the blending of experience with the present action of the mind. It is proper creation."