Riley manipulates shapes and colours in her paintings to generate complex visual sensations in the spectator. Here she explores the effects of tonal contrasts of warm and cold greys. Ovals painted in a range of cool greys are set against a dark, warm grey background. Where the darker ovals are seen against the dark ground, we become particularly aware of the difference in their colour. But where the tonal contrast is greatest, between the lighter ovals and the grey ground, the difference in colour is, as the title implies, denied.