 Phenomenalists tend to make use of the same sorts of features (function, intrinsic structure) in explaining some of the intuitive differences between thoughts and experiences; but they do not suppose that such features exhaust the differences between phenomenal and non-phenomenal representations. For the phenomenalist, it is the phenomenal properties of experiences – qualia themselves – that constitute the fundamental difference between experience and thought. Peacocke (1992), for example, develops the notion of a perceptual “scenario” (an assignment of phenomenal properties to coordinates of a three-dimensional egocentric space), whose content is “correct” (a semantic property) if in the corresponding “scene” (the portion of the external world represented by the scenario) properties are distributed as their phenomenal analogues are in the scenario.