international art movement whose name derives from the abbreviation of the term Optical Art. The movement emerged in the late 1950s and reached its peak between 1965 and 1968. The goal of Op Art is to produce the impression of relief, depth or vibration through visual and optical effects. To achieve this end, artists explore the relationships between colour and space, with the aim of evoking the intended physical experience in the beholder. Artists were influenced by, among others, theories of pure visibility and the theory and philosophy of perception. Although it became popular all over the world, it was in Europe where the movement had its greater development, with figures like Victor Vasarely (1908-1997) and also Carlos Cruz-Diez (1923-2019) and Jesús Rafael Soto (1923-2005); although Venezuelans by birth, these last two artists had settled in Paris in the 1950s and belonged to the circle who gathered around Galerie Denise René. In Spain, one of the main representatives of Op Art was the Valencian artist Eusebio Sempere (1923-1985).