Disappearing Objects, Louis De BelleIn Bergsons Matter and Memory the philosopher introduces two different operative modes of image perception: one of subjective idealism, the other of materialistic realism. The realist, argues Bergson, relies mainly on objective knowledge of a universe of images that exist in and of themselves, beholden only to the laws of nature and science. The idealist, on the other hand, must come to terms with the fact that they perceive this universe of images