Boulder Museum of Contemporary Art’s The Stubborn Influence of Painting contains no actual paintings whatsoever. But the concept of painting is evident throughout the exhibition, which “examines how the history of painting acts as a silent collaborator in the work of artists who create in other mediums.” The idea for the show has been percolating for many years in the mind of curator Kate Petley, who has been fascinated with “understanding the overarching tendency to categorize work based on medium.”