p390fig11.26 Although larger scales sometimes look closer (left image), that is not always true, as the right image of (Brown, Weisstein 1988) illustrates.  The latter percept is, moreover, bistable.  These images show the importance of interactions between groupings and multiple scales to determine perceived surface depths.<BR>||  Multiple-scale depth-selective groupings determine perceived depth (Brown, Weisstein 1988).  As an object approaches, it gets bigger on the retina.  Does a big scale (RF) always signal NEAR? NO!  The same scale can signal either near or far.  Some scales fuse more than one disparity.