Pablo Picasso was one of the greatest artists of the 20th century. Picasso developed the cubism movement and is widely seen as the founder of modern art. Picasso started painting in a realistic style but eventually moved on to a more abstract form. His masterpiece Guernica(1937) is a painting about the bombing of a Spanish village during the Spanish Civil War. This painting has become a reminder of the tragedies of war and an anti-war symbol. Other great paintings Picasso made are: Les Demoiselles d'Avignon(1907) and The Weeping Woman (1937).