Cook was one of the first British painters to experiment with spray-gun painting in the mid 1960s. Narrow bands of overlaid colour applied with mechanical regularity seem to resonate to create a disturbing but hypnotic Op Art effect. Concerning this picture he wrote, 'I would like it to be an occasion for meditation. The stillness of the work requires the onlooker to gaze for some time and feel the pulsating movement, then become part of the work in a holistic sense. Like sitting in an empty church and becoming very aware of ones-own-self.'