Line- the different lengths and widths placed by each other composes an image of a woman's figure. By placing lines at various distances from one another, the image gets more structure and gives the illusion of a body. A variation in width gives more dimension to the image and illustrates a sense of realism.
Bridget Riley. Around 1960 she began to develop her signature Op Art style consisting of black and white geometric patterns that explore the dynamism of sight and produce a disorienting effect on the eye. Her works were said to induce sensations in viewers as varied as seasick and sky diving.