A short review of an exhibition of Keith Sonnier's work at the Ace Gallery in Los Angeles. The reviewer calls Sonnier's new piece, which consists of two projections on opposite walls - one, a live video image of the wall itself, and the other a negative image of the same feed - a masterpiece. The reviewer lauds the installation as novel, painterly, and pure. Above all, the reviewer appreciates Sonnier's unaffected use of the new media technology, and the unassuming and simple means by which the television camera, telebeam projectors, and portable lasers are put to use.