Cubism

1906 Spanish artist Pablo Picasso (1881-1973)

1907 Huge canvas Les Demoiselles d's avignon., the painting represent not only a radical new phase in Picasso's art, but the beginning of truly modern art. It's also the first Cubist work.

Les Demoiselles d'Avignon (Pablo Picasso, 1907 Oil on canvas)

The formal qualities of this painting were crucially important for the development of Cubism; the nudes are treated in a structured, geometric way, their figures twisted into unnatural poses. The background is also treated in a fractured way and is pushed forward into the composition.

Picasso said that Art is a lie that makes us realize the truth. The difficulty in reading Cubist works highlights one of their contrail ambiguities: weather or not their aim is to  represent reality, or even to represent anything at all.

One important feature of Cubism is the enhanced expression role given to the formal qualities of a painting. In many works objects lack partial integrity and merge with those around them, and this device can be broadly related to the perceived compression of the time ans space created by new forms of communication.

Georges Braque (1882-1963) is another important cubist. He began to experiment with a more sculptural style. He mostly treated landscapes, focusing on features such as building and viaducts.

Harbour in Normandy (Georges Braque, 1909 Oil on canvas)

Strong, geometrical structure. Bright, subdued colour. He made great progress in his handing of space and volume using facets of colours.

Seated nude (Palo Picasso, 1910 Oil on canvas)

This figure is treated in facets bot not rally fragmented, rather the planes follow the contours and surface of body, the whole remaining easily recognizable.  By comparison with barque's works, this painting night seem timid.

Woman with a Mandolin (Georges Braque ,1910)

This is the first Cubist work to use an oval format. Here it also echoes the form of the composition, framing it better than would a rectangular canvas.

While I was googling the Cubism works, there are lots of different styled works under the same name. The cubism is quite unique and outstanding.

That's the early time of Cubism. In 1912, aware of that they had carried analytical Cubism as far as possible, Picasso and Braque developed several new techniques. Braque learned stencil and how to use steel combos to stimulate the effect of wood grain (Faux bois).
Good Friends help each other to progress. Their friendship could be admired and extolled forever.
Other famous, important Cubist
Paul Cezanne
Fernando Leger
Marc Chagall
Juan Gris

Ref: Cubism，Philio Cooper. Published at Phaidon Press Limited 1995
       Cubsim, Pierre Cabanne.. Published at Finest S.A./editions pierre terrail, Paris 2001