Prior to the painting, Picasso had become famous as one of the founders of Cubism, a style of art in which the subject or object in the painting appears fragmented into geometric forms.
Venerated today as a co-inventor of Cubism, which he developed in spirited competition with Pablo Picasso and Georges Braque, Gris is widely celebrated for pioneering a new kind of art.
The two paintings, shown by police ... to Nazi Germany during World War Two. The Cubist work, painted in 1939, is one of a number of portraits of Picasso's partner Dora Maar.
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