 A decisive time of its development occurred during the summer of 1911, when Georges Braque and Pablo Picasso painted side by side in Céret in the French Pyrenees, each artist producing paintings that are difficult—sometimes virtually impossible—to distinguish from those of the other.In 1912, they began to experiment with collage and Braque invented the "papier collé" technique.On 14 November 1908, the French art critic Louis Vauxcelles, in his review of Georges Braque's exhibition at Kahnweiler's gallery called Braque a daring man who despises form, "reducing everything, places and a figures and houses, to geometric schemas, to cubes".