Bridget Riley’s self-effacing title for this work – a bagatelle is something seen as a trifle, too easy to be considered profound – underplays the complexity of this lively composition. It also alludes to it being effectively an extracted section of a larger, early pivotal work – Tremor, painted in 1962. Even in abridged form it becomes a visual brain teaser, almost an IQ puzzle inviting the viewer to find rhythm in its sequence of pattern and line.

(Perilous: Unheard Stories from the Collection, 6 August 2022- )