Hanging from the ceiling are free swinging metal sheets ­ each made of rolled steel plates, 125cm or 150cm wide, 250cm high and 3mm thick. Sound transmitted through magnetically attached loudspeakers transform the metal sheets into vibrating walls, into resonating surfaces. The 75cm wide space between the suspended walls is filled with acoustic vibrations creating a vital enveloping sound space. Sound material: tubamultiphonics with overtone interferences.