Animators also create a dynamic stereoscopic window — a black box that frames the film — which is part of composition and is even used to enhance the action of a film.

Each window also gets coated with a thin Mylar film that and is then baked in an oven that stretches the UV-retarding material tightly against the glass, removing any visible imperfections.

Through the silver painted outline of a window on a wall are film images of men and women twirling, a scene from "Russian Ark", which was shot in St Petersburg's Hermitage.