Imagination lies at a kind of crux where perception, memory, idea generation, emotion, metaphor, and no doubt other labelled features of our lives, intersect and interact. Some of the images we experience seem "echoes" of what we have perceived, though we can change them, combine them, manipulate them to become like nothing we have ever perceived. Our memory seems to be able to transform perceptions and store their "echoes" in ways that do not always or perhaps very often require quasi-pictorial "images", (as in the cases of sounds and smells, say). Novelty in ideas has nearly always been connected with the powers of imagination to "see" solutions to problems. Our emotions seem tied to these mental images; when we imagine something we tend to feel as though it is real or present, such that it seems our "coding" and "access" to images is tied in with our emotions. The logic of imagination seems to conform more readily with that of metaphor than with any scheme of rationality we can be explicit about.