Jean Metzinger see the cubist works in Room 7 and 8. While Pablo Picasso and Georges Braque are generally acknowledged as the founders of the twentieth-century movement that became known as Cubism, it was Jean Metzinger, together with Albert Gleizes, that created the first major treatise on the new art-form, "Du "Cubisme"", in preparation for the Salon de la Section d'Or held in October 1912. "Du "Cubisme"", published the same year by Eugène Figuière in Paris, represented the first theoretical interpretation, elucidation and justification of Cubism, and was endorsed by both Picasso and Braque. "Du "Cubisme"", which preceded Apollinaire's well known essays,
Georges Stein as male, some gallery websites describe Stein as a female painter. Georges Stein Georges Stein was a late 19th and early 20th century French painter, best known for scenes of Parisian street life. Sources conflict about Stein's dates of birth and death. The Benezit Dictionary of Artists gives the year of birth as "c. 1870". The auction house "Christie's", among others, gives the dates 1855–1930, and the French National Library the dates 1870–1955. Moreover, the journal "L'Éventail" of 15 January 1918 mentions "the painter Georges Stein who recently died at Geneva". There is also some confusion as to the gender