Street artists include portrait artists, caricaturists, graffiti artists, muralists and people making crafts. Another source is the "underpainting" techniques of the Mexican muralists painters. Other influences on his drip technique include the Mexican muralists and Surrealist automatism. The youngest of the muralists, George Albert Harris, painted a mural called "Banking and Law". Governments such as the Mexican government utilized muralists to create propaganda. The two leftist Mexican muralists argued forcefully with one another about art during one visit. It was a culmination of many influences, the Mexican muralists, Breughel, and his Christianity. Some muralists will paint directly without any prior sketching, preferring the spontaneous technique. He associated with the Depression-era muralists in the San Francisco Bay Area. The muralists conveyed historic and political messages. The current trend for feature walls has increased commissions for muralists in the UK. N'diaye about women muralists in Oualata, Mauritania.