This volume documents a group of gouache studies by Bridget Riley from 1969 to 1972 that reflects a major reconfiguration of Riley’s style. The shapes formed in these gouaches are arranged from a limited selection of colours – namely violet, green and pink – to explore the visual relationship between 'contrast and harmony’.

Accompanying full colour illustrations, a conversation between the artist and Robert Kudielka from 1972 posits the works within the context of Bridget Riley’s oeuvre.