From: The World In Your Head by Steven Lehar
Fig. 7.6 A schematic depiction of a hypothetical scheme for various cortical mappings, to demonstrate the invariance relation that must hold between different maps. (A) The retinotopic map, as in the primary visual cortex, shown for three different views. (B) A head-centered map in which the image of the world rotates as the man moves his head, but the head remains fixed at the center of the space. (C) A world-centered mapping, presumably like a parietal representation, in which the image remains oriented to the coordinates of the external world. These different representations remain tightly coupled despite their differences in reference frame, so that changes calculated in one map are communicated immediately to the other two.