From: The World In Your Head by Steven Lehar

Fig. 6.9 (A) The platonic solids depicted in the “thought clouds” here represent a separate brain-anchored representation of geometrical form, which is coupled to the perceptual sphere in such a way that the presence of one or more exemplars of any particular shape in the perceptual field lights up the corresponding shape node, as if in answer to the question “What do you see?” (B): The system works in reverse also, where a top-down priming of the invariant concept “cube” in turn “lights up” or draws attention to all cubes currently present in the perceptual field, whatever their rotation, translation, or scale, as if in answer to the question “Where are the cubes?” The answer to the question is presented in the perceptual world where the cubes themselves are observed to lie.