Seductively simple and deeply delicious, Bridget Riley's colorful world is one of perfectly structured beauty. Her works seem to dance across the sheet with each atom of color, of line and of form in its perfect place. Perfecly balanced. Perfectly presented.  Her geometric forms of circles, lines, squares, and curves radiate the confidence and genius of an artist whose elegance and master of form and color have cemented her as one of the 20th Century greats.