St. Louis, Missouri( CNN) A Bosnian refugee became world-renowned aerosol artist is putting the finishing touch on an impressive 1,000 -square-foot canvas.

Wearing a gas mask, standing on scaffolding for hours at a time and using endless cans of spray paint, Paco Rosic is painting the history of St. Louis, Missouri, on the ceiling and walls of a building not far from Budweiser.

Rosic’s art takes spectators on a jaunt from settlement of the Mississippi River town in the mid-1 700 s through the World’s Fair and into the development of its iconic athletics teams and beer factories.