1.   Beneath the passages is a row of trash cans from which blares the sound of marching troops.

2.   The sound of marching troops comes out of a squadron of trash cans.

3.   The installation piece consists of a wall lined with garbage cans, each containing a speaker playing audio of marching troops.

4.   The military pictures of naval fleets and marching troops raise the specter of the last war in the Gulf.