DIY Masterpieces

John Cage did it himself. Nancy Spero did it herself. Now you can too. \'Do It,\' curated by Hans-Urlich Obrist, is a collection of instructions for events, performances, objects, sketches, etc., crafted by more than 60 contemporary artists. Execute your own John Baldessari -- hang it in your home if you like. Upload your results and check out other people's. \'Do It\' started out as an offline exhibition, then appeared as a catalog, and now it's online, with a new crop of instructions by Diller and Scofido, Joan Jonas, Nam June Paik, and Yoko Ono.