Short for optical art, this style of art uses optical illusion. Op Art is abstract and usually made in black and white, though some optical artists used color and color contrast to great effect.
Bridget Riley is the most famous optical artist. She used viewers’ own eyes as much as she used paint and color theory. “It is important that the painting can be inhabited,” Riley wrote, “so that the mind's eye, or the eye's mind, can move about it credibly.”
Image: Bridget Riley, Intake (1964). Acrylic on canvas. 178.5 x 178.5 cm.