Op art uses optical illusions to create abstract works that often feature movement, hidden images, or patterns when viewed. It is created through the use of lines and patterns, especially black and white stripes like Bridget Riley's famous painting Current from 1964, which causes the eye to perceive movement and shifting figures. Some op artists like Bridget Riley, Julian Stanczak, and Richard Anuszkiewicz also use color as the primary focus, adding the element of contrasting hues to generate optical effects.