Plot: Mel Chin, Matthew Barney, Michael Ray Charles and Andrea Zittel, artists "who raise questions about the things we consume every day," says tennis great John McEnroe, who introduces the hour. Marshall explores racial stereotypes; filmmaker Barney approaches themes of sex and conflict elliptically; Zittel lives in---or wears---her utilitarian "installations"; and Chin's art has found its way into everything from a burned-out Detroit house to TV's "Melrose Place