p002fig01.01 The difference between seeing and recognizing.<BR>||  (W. Epstein, R. Gregory, H. von Helmholtz, G. Kanizsa, P. Kellman, A. Michote...) Seeing an object vs Knowing what it is.  Seeing Ehrenstein illusion (See, recognize) va Recognizing offset grating Do not see, recognize).  offset grating: some boundaries are invisible or amodal.