Plus Reversed is a key example of what has been called Optical art or Op art in the United States—a painting whose color and pattern conjunctions cause involuntary perceptual effects in its viewer. Here the artist paired the complementary colors of red and green in repetitive patterns of plus-shaped signs, reminiscent of the voltage symbols on a battery. The juxtaposition of colors intensifies their vividness and induces a flickering retinal effect. The patterning creates a further reverberation of its own by changing colors as it expands outward, suggesting movement.
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