Cubism was one of the most innovative art movements of the 20th century, but it was a clear reformulation of the post-impressionism wave that came decades before. For instance, the deconstruction of shapes into precise angles and distinct areas can be seen in the work of Paul Cezanne as early as 1885. In fact Picasso openly acknowledged the influence of Cezanne on his work, describing him as ‘my one and only master’.