Wall with porthole and optical illusion

Keywords:

op-art, op, art, bridget, riley, optical, illusion, geometric, abstraction, visual, confusion, hypnotic, hypnosis, hard-edge, brick, astigmatism, wall, confusing, port, hole, porthole, background, abstract, house, building, architecture, window, wonderwall, astigmatic, wonder, hard, edge, trompe-l, oeil, dazzle, dazzling, text, space, for, orange, brown, tertiary, colours, colors,