Plot: The Season 5 premiere highlights artists who seek to reconcile past with present, expose injustice and celebrate tolerance in their works, including South African native William Kentridge, who creates poetic allegories on stage and film. Also: visual artist Carrie Mae Weems, who reflected on how the 1960s influenced the 2008 presidential election in a photo-video series, and Doris Salcedo of Colombia, who honors her country's marginalized peoples through sculptures and installations