converging to a point vs. rounded. These variations in the generating of geons create shapes that differ in NAPs. Experimental tests of the viewpoint invariance of geons There is now considerable support for the major assumptions of geon theory (See Recognition-by-components theory). One issue that generated some discussion was the finding that the geons were viewpoint invariant with little or no cost in the speed or accuracy of recognizing or matching a geon from an orientation in depth not previously experienced. Some studies reported modest costs in matching geons at new orientations in depth but these studies had several methodological shortcomings. Research on geons There is much research out about geons and how they are interpreted. Kim Kirkpatrick-Steger, Edward A. Wasserman and Irving Biederman have found that the individual geons along with their spatial composition are important in recognition. Furthermore, the findings in this research seem to indicate that non-accidental sensitivity can be found in all shape discriminating species. Notes Vision Perception Spatial cognition