English artist Bridget Riley is renowned for her contribution to the Op Art movement. Her flagship works deploy optical illusions using black and white geometric patterns. Her early pieces nearly all used black and white, with the occasional addition of grayscale tones. As her career developed she began introducing colours in to her work, and she would experiment with how the addition of different colours in patterns lent a sense of movement to her pieces. Riley travelled extensively and drew inspiration from the places she visited, particularly with regard to the colours she chose to work with. ‘Shadow Play’, an oil on canvas that she produced in 1990, was heavily influenced by Riley’s interest in the Egyptian hieroglyphs in the 1980s. She is also well known for her murals, which have been created for museums in Paris and London.