In performance, Public works (Ralph Johnson and Lloyd Dunn) make use of multiple obsolete technologies which create a barrage of moving pictures and processed sounds. The Grand Delusion in particular makes use of a technique called PolyVision, a process borrowed from the pioneering French filmmaker Abel Gance. Three 16mm projectors run simultaneously, creating a panorama of collaged moving images. The center image is a reel entitled The Grand Delusion (1994), which is flanked by 16mm film loops from the other two projectors to augment the images on the center screen. The repetitive quality of the film loops serves, too, to underscore the continuity and rhythms of the music. Matter (1997), the second half of the performance, makes use of similar techniques. Where the music in The Grand Delusion is tape-based, making use of the analog recording studio as a musical instrument, the audio for Matter is digital in conception and execution. The visual portion of the presentation is an extension and elaboration of techniques used in The Grand Delusion.-Ralph JohnsonPublic works is an extension of the Tape-beatles project (1987-1994), a body of works consisting of "syntheties," compositions using concrete music and tape collage techniques.