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Focusing on simple forms, such as lines, circles, curves and squares, Riley developed her own signature style - known as Op Art, or optical art - using optical illusions with the aim of actively engaging the viewer and disorientating them by triggering sensations of movement.

He was one of the pioneers of kinetic and optical art whose abstract, often geometric works are on display in many of the world's leading museums.

These mixed with ’60s optical art black-and-white checks that were used effectively in kinetic uber-mini coat dresses.

The artist, who was born in Venezuela and has lived and worked in Paris since the 1960s, is considered a pioneer of kinetic and optical art, movements that toy with the sensory nature of light, movement and color.

Designs range from optical art to bold florals and are meant for various occasions, such as birthdays or personal notes.