Circles are predominately used to form the art within this world, the natural world itself (Note how the storm clouds in an early scene are tangled masses of
thin, swirling lines of various shades of gray), and frames to outline characters and scenes (notably a shot of the witch's owls, which are designed with round heads, attempting to crack a
circular window and another showing the orb of the witch's eye fitting neatly into the outlines of a eye -
shaped peephole).
The works are fashioned from the same small handful of materials and
shapes: tubes of stainless steel;
circular and rectangular sheets of transparent and reflective glass;
thin lines cutting out, carved into, or painted on to hard surfaces.