Inge Reist is director of the two-year-old Center for the History of Collecting in America at the Frick's Art Refernce Library—essentially it's a think tank. Research is focused on the history of art collecting and patronage. According to Ms. Reist, the material conditions under which art was paid for, displayed and preserved is essential to understanding the history of art. In this way, collectors decide what is art, and what is not.