Insulated glass pane encasing a roll of c))motion plastic. Placed in bright sunlight, the roll unfurls and blocks excess sun from entering the room. With hazy sun, the roll partly unfurls. On gray days or at night, the c))motion material remains tightly curled at the top of the window pane.
A simple, passive device to save energy and respond to a changing environment.
Movie runs 2x actual speed
More info in the FAQ