lead directly into the Cubist period that follows. Analytic cubism: 1909–1912 Analytic cubism (1909–1912) is a style of painting Picasso developed with Georges Braque using monochrome brownish and neutral colours. Both artists took apart objects and "analyzed" them in terms of their shapes. Picasso and Braque's paintings at this time share many similarities. In Paris, Picasso entertained a distinguished coterie of friends in the Montmartre and Montparnasse quarters, including André Breton, poet Guillaume Apollinaire, writer Alfred Jarry and Gertrude Stein. In 1911, Picasso was arrested and questioned about the theft of the Mona Lisa from the Louvre. Suspicion for the crime had initially fallen upon Apollinaire due to his links to Géry Pieret, an artist with a history of thefts from the gallery. Apollinaire in turn implicated his close friend Picasso, who had also purchased stolen artworks from the artist in the past. Afraid of a conviction that could result in his deportation to Spain, Picasso denied having ever met Apollinaire. Both were later cleared of any involvement in the painting's disappearance. Synthetic cubism: 1912–1919 Synthetic cubism (1912–1919) was a further development of the genre of cubism, in which cut paper fragments – often wallpaper or portions of newspaper pages – were pasted into compositions, marking the first use of collage in fine art. Between 1915 and 1917, Picasso began a series of paintings depicting highly geometric and minimalist Cubist objects, consisting of either a pipe, a guitar or a glass, with an occasional element of collage. "Hard-edged square-cut diamonds", notes art historian John Richardson, "these gems do not always have upside or downside". "We need a new name to designate them," wrote Picasso to Gertrude Stein. The term "Crystal Cubism" was later used as a result of visual analogies with crystals at the time. These "little gems" may have been produced by Picasso in response to critics who had claimed his defection from the movement, through his experimentation with classicism within the so-called return to order following the war. After acquiring some fame and fortune, Picasso left Olivier for Marcelle Humbert, whom he called Eva Gouel. Picasso included declarations of his love for Eva in many Cubist works. Picasso was devastated by her premature death from illness at the age of 30 in 1915. At the outbreak of World War I in August 1914, Picasso was living in Avignon. Braque and Derain were mobilized and Apollinaire joined the French