The man on the canvas is Marc Chagall, one of the most beloved artists of the 20th century, and the painting is Double Portrait With Wine Glass, an 8-foot portrayal that is the masterpiece in an exhibition at the Art Gallery of Ontario (AGO) in Toronto that runs through Jan. 15, 2012.Chagall and the Russian Avant-Garde includes 118 works from the Centre Pompidou in Paris, with 32 Chagall piece