Young and Zazeela's first continuous electronic sound environment was created in their loft on Church Street, New York in September 1966 with sine wave generators and light sources designed to produce a continuous installation of floating sculptures and color sources, and a series of slides entitled "Ornamental Lightyears Tracery". This "Dream House" environment was maintained almost continuously from September 1966 to January 1970, being turned off only to listen to "other music" and to study the contrast between extended periods in it and periods of silence. Young and Zazeela worked, sang and lived in it and studied the effects on themselves and visitors. Performances were often extreme in length, conceived by Young as having no beginning and no end, existing before and after any particular performance. In their daily lives, too, Young and Zazeela practiced an extended sleep-waking schedule—with "days" longer than twenty-four hours.