p107fig03.25 <I>The Roofs of Collioure</i> by Matisse.  See the text for details<BR>|| p107c1h0.6 "... [Matisse] showed how patches of pure color, when laid down properly on a canvas, could be grouped by the brain into emergent boundarues, without the intervention of visible outlines. ... The trick was that these emergent boundaries, being invisible, or amodal, did not darken the colors in the surface representations.  In this sense, Matisse intuitively realized that "all boundaries are invisible" through the masterful way in which he arranged his colors on canvas to generate boundaries that could support compelling surface representations. ..."