Alongside with his wife Sonia Delaunay, he co-founded Orphism, a movement that emphasized vibrant color and dynamism. His works were based on the optical characteristics of brilliant colors, so that they functioned as the form itself, while rejecting rigid structure to express rhythm and energy through overlapping forms and bold contrasts. His theories on color and light were highly influential, shaping the work of many, especially in the context of modern life and the urban landscape.