Eight never-before-seen gouache studies are at the centre of this volume, illustrating Bridget Riley's dynamic approach to colour. 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.