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The Perceptual Observer is a timeline devoted to perceptually or optically based art. Comments may be sent to q2222@earthlink.net.
Left to Right: Richard Anuszkiewicz, Temple to Sunset #754, acrylic on canvas, 1985; Frank Stella, Untitled, (from 10 x 10 portfolio), silkscreen, 1964; Gabriele Evertz, Motion Parallax, acrylic on canvas, 1998.