The writer Janet Malcolm once described David Salle’s paintings as “full of images that don’t belong together.” Since the 1970s, he has appropriated and remixed styles and iconography from a vast array of seemingly unconnected sources including commercial advertising, cartoons and old masters paintings. A new exhibition that Salle has organized at the Hill Art Foundation in New York, called “Beautiful, Vivid, Self-Contained,” is dedicated to the memory of Malcolm, who died last year.