To try and adjust the lighting conditions lighting specialists will go to great lengths to control the amount of light that enters any particular space using an overhead scrim

In the case of the picture below, a series of overhead scrims was rigged on a catenary wire rig to able their positioning across a wide area. The ruffled edge is an attempt to disguise any straight, linear shadows.

Riggers would use the catenary wire rig to slide the scrims from one side to the other, in an effort to follow the suns path, A labour intensive process. Any wind would complicate matters as the scrims would behave like a kite.