David Russell and Roberto del Hoyo are graffiti artists frustrated with the mural situation in Los Angeles. There’s a city ordinance on the books that makes any mural on private property illegal. So fourteen months ago the duo, who met in grad school, started the Mobile Mural Lab. It’s an old search and rescue truck they bought off Craigslist and they use it to bring murals to the people. They take it to schools and neighborhoods that invite them and everyone from famous graffiti artists to young school children are invited to paint the sides of the van.