op art(n = noun.artifact) - a style of abstractionism popular in the 1960s; produces dramatic visual effects with colors and contrasts that are difficult for the eye to resolve;
is a kind of abstract art, abstractionism

op art, n. colloq. = optical art.

Etymology:
abbr.

abstract art, art, art class, art collection, art critic, art dealer, art deco, art department, art director, art editor, art exhibition, art form, art gallery, art historian, art history, art movement, art nouveau, art object, art paper, art rock, art school, art song, art student, art tatum, art teacher, art union, art work, black art, clip art, co op, commercial art, culinary art, dramatic art, fine art, folk art, glyptic art, graphic art, martial art, minimal art, naive art, outsider art, photo op, plastic art, pop art, primitive art, self-taught art, state of the art, vernacular art, work of art