Hector Guimard, a French architect, designed the Pars Metro Sign in the 1900s. Guimard was a prominent figure of the Art Nouveau movement; he moved away from gothic designs and focused on integrating long organic shapes and curves. The Pars Metro Signs were made of cast iron and referenced growing plants. Some entrances had a glass covering shaped like flower petals stemming from the entrance. Over 100 signs were constructed, and 80 remain in Paris today.