p115fig03.39 Two of Gene Davis's paintings in full color (top row) and in the monochromatic versions (bottom row).  The text text explains how they achieve their different percepts of grouping and relative depth.<BR>|| Gene Davis [Black popcorn, Pink flamingo] in [full color, monchromatic]. p115c1h0.8 "... His paintings ... are built up from vertical stripes. They do not contain size differences, shading, or recognizable objects. ...".  p115c2h0.15 "... For starters, color similarities and/or almost equal luminances between stripes can influuence whether the viewer's eyes are drawn to individual stripes or groups of stripes. The achromatic versions of the two paintings more clearly show regions where the color assimilation is facilitated. ... Such form-sensitive spatial attention is called an <I>attentional shroud</i>.  An attentional shroud, in turn, is created by a dynamical state in the brain that I call a <I>surface-shroud resonance</i>. ...".