Around the same time, cubist works were being shown in Paris and Robert had been studying the colour theories of Michel Eugène Chevreul; they called their experiments with colour in art and design simultanéisme.
Omtrent på samme tid, kunne man studere kubistiske værker på udstillinger i Paris, og Robert havde studeret Michel Eugène Chevreuls farveteorier; de kaldte deres eksperimenter med farve i kunst og design for simultanéisme.