Czech painter and illustrator Alphonse Mucha (1860-1939) ranks among the pioneers of the Art Nouveau movement at the end of the 19th century. Virtually overnight, he becomes famous in Paris thanks to the posters that he designs to announce actress Sarah Bernhardt’s plays. But at the height of his fame, Mucha decides to leave Paris to realize his lifetime project.

In 1989, a collective of young hip hop artists gathered at a health food café in South Central Los Angeles. Their mandate? To reject gang culture and expand the musical boundaries of hip hop. DuVernay's documentary chronicles the historic legacy of the Good Life Cafe — the open mic nights that became an L.A. institution, the eclectic array of talented young MCs that emerged there, the alternative hip hop movement they developed, and their worldwide influence on the artform.

Through interviews and guerilla footage of graffiti writers in action on five continents, the documentary tells the story of graffiti from its origins in prehistoric cave paintings thru its notorious explosion in New York City during the 70’s and 80’s, then follows the flames as they paint the globe.