p114fig03.38 Four color-field spray paintings of Jules Olitski.  The text explains why they generate surfaces percepts with such ambiguous depth.<BR>|| Jules and his friends (1967), Lysander-1 (1970), Instant Loveland (1968), Comprehensive Dream (1965). p114c2h0.4 "... it is impossible to visually perceive descrete colored units within the boundary webs in Olitski's spray paintings. ... create a sense of ambiguous depth in the viewer, similar to staring into a space filled with colored fog, or into a sunset free of discrete clouds.  Olitski intentionally created this effect. ...".