His paintings of the early 1900s accurately represent the era in which he lived: a happy, bustling Paris, la Belle Époque, with horse-drawn carriages, trolley cars and its first omnibuses.

Galien-Laloue's works are valued not only for their contribution to 20th-century art, but for the actual history, which they document.

A typical Galien-Laloue painting depicts sidewalks and avenues crowded with people or tourists mingling before the capital's monuments.

He also painted the landscapes of Normandy and Seine-et-Marne, as well as military scenes he was commissioned to produce in 1914.

He used other names: "L.Dupuy", "Juliany", "E.Galiany", "Lievin", "G.L" "Dumoutier" and "P.Mattig" to market his paintings more broadly outside the contract.