Side by side Picasso V Matisse Author:Sebastian Smee Matisse and Picasso influenced each other fro 1905 on, and their relatioship grew into one of the greatest creative rivalries the world has ever seen. This is the story of that relationship, from its beginnings in the salons of Paris and under the auspices of Gertrude and Leo Stei through the years leading up to World War I and beyond.