p132fig04.11 Simulations of a double step (left panel) and the Craik-O'Brien-Cornsweet (COCE) illusion.  Note that discounting the illuminant creates similar feature contour patterns, from which the fact that the COCE looks like the double step follows immediately.<BR>|| Simulations of double step and COCE. [stimulus (S), feature (F), boundary (B), output].