How was Cubism created?

Cubism started in Paris (France) in the early 20th Century, when Pablo Picasso and Georges Braque started to cooperate very closely by visiting their ateliers daily and exchanging all their ideas and new visual inventions in the years 1907 - 1914. Appolinaire became soon the art critic who connected himself to Cubism and published a lot in those years.

Then Braque had to join the French army in World War 1 (Picasso was not French!) and was severely injured in 1915. He recovered but was also changed a lot in his personality; their close relationship in making Cubist art was ended by then.

See the quotes by Picasso and Braque.

"Almost every evening ( around 1908, fh), either I went to Braque's studio or Braque came to mine. Each of us had to see what the other had done during the day. We criticized each other's work (a remark Picasso told Francoise Gilot already in December 1908)"

from "Futurism", ed. By Didier Ottinger; Centre Pompidou / 5 Continents Editions, Milan, 2008, p. 311, note 721 (art quotes, Pablo Picasso)

"At that time (around 1907/08) I was very friendly with Picasso. Our temperaments were very different, but we had the same idea. Later on it became clear, Picasso is Spanish and I am French; as everyone knows that mean a lot of differences, but during those days the differences did not count… …We were living in Montmarte, we used to meet every day, we used to talk… …In those years Picasso and I said things to each other that nobody will ever say again, that nobody could say any more… …It was rather like a pair of climbers roped together."

from a conversation with Dora Vallier, 1954; as quoted in "Letters of the great artists - from Ghiberti to Gainsborough -", Richard Friedenthal, Thames and Hudson , London, 1963

Picasso and Braques both were looking for a way to show different viewpoints on a two dimensional surface.