Abstract: A folding square framework which may serve as a support for a tensile canvas or membrane. This framework, which may be mounted on a fixed column or wall, may fold, around hinges set at 54.3° to the longitudinal axes of each member of the framework, at each corner, compactly together such that all four sides of the framework are rested parallel with one another, perpendicular to the plane of the unfolded structure.

Abstract: A cinema sound production device, to be located behind screen, which will produce a phase-coherent spheroidally shaped superimposed wavefront which has an adjustable, determinable radius, thus possessing a stable psycho-acoustic virtual point source, which may move in a continuously variable manner from infinity to within the plane of the device, as well as in any 3 dimensional axis, thereby, with the use of a positioning track and a computer, being able to be keyed in cinematic post production to visual location as displayed on a screen.