Major nonvisible works from his early period include Carrier Wave, in which Barry used the carrier waves of a radio station for a prescribed length of time "not as a means of transmitting information, but rather as an object.",Kristine Stiles, Peter Howard Selz, Theories and Documents of Contemporary Art (University of California Press, 1996), p. 839, Radiation Piece, and Inert Gas Piece, in which Barry opened various containers of inert gases in different settings before groups of spectators, such as a canister of helium released in a desert.
