Henri Rousseau, or The Burgeoning of Modern Art: Henri Rousseau started to paint in Paris around 1880, at the age of 40. This self-taught artist was friendly with the poet Apollinaire, Robert Delaunay and Pablo Picasso, who recognized his genius, and yet his work was to remain underrated during his lifetime. However, with its dislocated compositions and profoundly dreamlike subject matter, it was to have a decisive influence on modern art, from surrealism to abstract art.