That year he participated at the Grand Exposition Internationale des Arts Décoratifs et Industriels Modernes in Paris where he exhibited “Les Perruches” (also known as The Parrots or The Parakeets), which has become one of the most recognizable painting of the Art Deco movement which flourished between the two world wars, was at its highpoint at this exhibition and culminated at the New York World’s Fair in 1939.
Dupas has worked in various exponents of the Nouveau and Deco areas, such as the fashion magazine Vogue and Harper's Bazaar.
In 1925 at the Exposition Internationale des Arts Décoratifs et Industriels Modernes in Paris, he showed Les Perruches, one of his most famous oil on canvas.
[3] In the 1930s, Dupas was commissioned by Frank Pick to produce the artwork for a series of posters for the underground network of London Transport.
In 1934, Dupas created fabulous glass panels, used by Charles Champigneulle for the corners of the Normandie's first-class Grand Salon representing the history of navigation, using a technique known as verre églomisé in which portions of the pictorial scene were painted in black and various pastel colors on the reverse of plate-glass panels.