Artwork description & Analysis: Endless Rhythm was named by Sonia Delaunay as a way to describe the cyclical looping effect of the circular forms that seem to mimic the flow of electric currents. By 1930 Delaunay had returned to abstraction, producing the large spinning disc compositions for which he is perhaps best known. Building on his earlier experiments, Delaunay achieved the illusion of movement through juxtaposition of colors with geometric form. Delaunay carefully selected his colors to present subtle gradients and then contrasts these with the thick black and pale blue background. The diagonal composition enhances the effect of dynamism. A year after this painting was produced, the discs were brought to life on a monumental scale in his public murals for the Paris exposition.