This not that, the Artist John Baldessari

The paintings that artist John Baldessari cremated in 1970 might be worth some money today. They're still worth something as a concept, though, and he kept photos and video to ensure that. This Not That: The Artist John Baldessari opens with that scene of artistic destruction, one of many acts of conceptual art that Baldessari has committed over the years.
　　This Not That gives a more in-depth portrait than other recent Arthaus Musik releases have provided, showing many of his works, including text paintings which put a few simple words against a background, commissioned paintings from slides he provided, and films, including one in which he creates a Psalm-like song about conceptual art. There's also more room for Baldessari's philosophy on his work, delivered gently with a matter-of-fact bluntness.
　　~Text taken from a review @DVDverdict.com