Op artArt refers to a diverse range of human intellectual and expressive activities and the outcomes of those activities. Within this context art is further defined as visual art and includes painting, drawing, sculpture, printmaking, photography and work made using digital media. stands for ‘optical art’ and is an art formForm refers to three dimensional objects. While shapes have two dimensions (height and width), forms have three dimensions (height, width and depth). The overall unity of the visual elements in an art work; it is usually contrasted with content. Form is sometimes used to refer to the three dimensional aspect of an art work, as opposed to shape, which is seen as referring to two dimensional aspects. based on abstractWhen applied to art, it usually refers to work which is not representational. Abstract art is concerned with ideas that are drawn away from everyday reality and given expression. The artist's starting point is sometimes based on aspects of reality but is often concerned with the depiction of ideas that have no basis in everyday reality. Work that is recognisably drawn from real life is sometimes called ‘semi abstract’. geometric patterns, usually lines circle sand squares painted in strongly contrasting colours. The effect of such pictures is such that it produces optical shimmers, flickering and after-images in the eye of the spectator. Bridget Riley and Victor Vasarely are leading exponents of this style.