Victor Vasarely. CHEYT-MC-4, 1971. Victor Vasarely, widely regarded as the father of Op Art, was one of the most influential figures of 20th-century abstract art. His research into visual perception, color, and geometry transformed the relationship between viewer and image, creating compositions capable of producing movement, depth, and vibration through precise mathematical structures. 'Copyright 1975 Editions du Griffon, Neuchâtel/Suisse' on the back. Dry stamp of the Vasarely Foundation. Photolithography on gloss paper. Total dimensions: 27 x 27 cm. Fine condition. In CHEYT-MC-4 (1971), Vasarely develops an optical structure based on a hexagonal grid that progressively curves to generate the illusion of an emerging sphere at the center of the composition. Unlike his cubic constructions, the geometry here becomes more organic, creating a fluid transition between surface and volume that suggests a radial expansion of space. The central red core acts as a point of maximum visual intensity, while the gradation toward blues and turquoise tones in the periphery reinforces the sense of depth and immersion. This chromatic organization not only models the form but also induces a dynamic perception in which the sphere appears to pulsate or fluctuate, actively engaging the viewer’s retina. The work belongs to a mature phase in which Vasarely refines his visual vocabulary, integrating complex geometric systems with a rigorous chromatic logic. Here, the image operates as a field of perceptual energy rather than a static representation, anticipating later developments in digital art, algorithmic visualization, and parametric design.