s an "official" movement, Op Art has been given a life-span of around three years. This doesn't mean, though, that every artist ceased employing Op Art as their style by 1969. Bridget Riley is one noteworthy artist who has moved from achromatic to chromatic pieces, but has steadfastly created Op Art from its beginning to the present day. Additionally, anyone who has gone through a post-secondary fine arts program probably has a tale or two of Op-ish projects created during color theory studies.