Bridget Riley is an English artist best known for her work in the Op Art movement. Her signature pieces explore optical illusions using geometric patterns in black and white. Though her early works focused primarily on these colours with occasional additions of grey scale tones, she included colours in her later works. Her explorations of colours led to experimentation with how colours in patterns create the sensation of movement within compositions. She was inspired by her extensive travels to include colour palettes from the places she visited. Notable examples of this process include Shadow Play, an oil on canvas from 1990, which was inspired by her study of hieroglyphs in Egypt ten years earlier.