Scissor-Hinged Membrane Structures is a system for retractable membrane roofs that need a moveable supporting structure and multiple stable "roof-configurations" — open ↔ intermediate ↔ closed.

Strips of structural membranes are spanned between parallel scissor-arches. The ridges and valleys of the membrane strips are alternatively connected to the top and bottom hinges of the scissors. The scissor structure and the membrane surface can, therefore, be folded and unfolded together, while preserving an overall wave-like shape. By dividing the roof into two separate (scissor-hinged) panels, and by cantilevering each of these panels over an additional moveable supporting structure, the roof can retract to opposite sides of the space underneath.
In each configuration of the roof, the membrane surface is tensioned by an actuation system with pleated pneumatic artificial muscles. This allows the roof to be used —as a roof— in multiple configurations.