Herb and Dorothy, a documentary film by Megumi Sasaki; You don't have to be a Rockefeller to collect art

Robert Mangold '1/2 Blue-Gray Curved Area'
Originally uploaded by hanneorla

Herb and Dorothy is a 2008 documentary film by Megumi Sasaki, says Wikipedia.

The film tells the story of two middle-class collectors of contemporary art, Herbert and Dorothy Vogel, and the enormous and valuable collection of conceptual art and minimalist art they amassed.[2]

Many artists are interviewed in the film, including Christo, Chuck Close, Robert Mangold, and Pat Steir.