Bridget Riley and Op Art: When Painting Affects the Body

In 1965, the Museum of Modern Art in New York organized an exhibition titled The Responsive Eye. The title itself was a manifesto. The art presented there wasn't meant to be merely observed. It aimed to act. On the retina, on the nervous system, on the viewer's physical perception. Visitors left disoriented, sometimes nauseous. Critics spoke of trickery, cheap illusion. The artists, however, spoke of real, measurable, reproducible perceptual phenomena.

Bridget Riley was at the heart of this exhibition. Born in London in 1931, she began by copying Seurat, studying divisionism, analyzing how the juxtaposition of pure colors creates a vibration that the eye cannot resolve. From this meticulous observation, she drew a radical conclusion: if color and form can produce physical effects on the viewer, then painting is not a representation of the world. It is a direct intervention on perception.

Her first major works were in black and white. Movement in Squares in 1961, Current in 1964, Fall in 1963: grids, undulations, parallel lines that imperceptibly vary in thickness or spacing, producing a sensation of movement, depth, and vibration on a perfectly flat surface. This is not an illusion in the sense of a sleight of hand. It is the result of a precise understanding of how the eye processes visual information, of retinal persistence, of how the brain tries to resolve tensions it cannot stabilize.

Victor Vasarely, a Hungarian based in Paris, had been exploring the same territory since the 1930s. His 1938 Zebra is often cited as the foundational work of Op Art: black and white lines that make the figure shift against the background, producing movement where none exists. But where Vasarely constructs quasi-mathematical systems, Riley works more intuitively and physically. She doesn't seek to demonstrate. She seeks to produce an experience.

From 1967, she reintroduced color. Not to represent something, but to exploit the interactions between adjacent hues. Bands of pure colors, side by side, creating vibrations at their borders, bringing forth colors that don't exist in the paint, transforming a static surface into something pulsating. In 1968, she became the first woman to win the Grand Prize for Painting at the Venice Biennale.

What makes this work particularly relevant for thinking about textile design is the question Riley has posed from the beginning: at what scale does an optical effect work? A vibration that operates on a 150 cm canvas doesn't necessarily operate on a 10 cm reproduction. The frequency of the lines, the gap between hues, the size of the modules – everything must be calibrated according to the viewing distance. This is precisely the challenge of translating an optical effect into a rug: the hand, the wool, the tufting stitch introduce a variability that painting does not have. What Riley mastered with pen and brush on stretched canvas must be recreated in an organic material, by hand, in large format, designed to be seen from multiple distances simultaneously.

The problem is the same. The solutions are different. That's where the work begins.