Six optical-device-like artworks populated the long gallery of Castello Rivoli known as the Manica Lunga. Eliasson calls these works, which were inspired by scientific instruments and cabinets of curiosity, kaleidoramas, a portmanteau of the words kaleidoscope and panorama. The interiors of the wedge-shaped structures seemed larger than physically possible – the result of an optical illusion created through abutting mirrors. Visitors entered from below the constructions or faced straight on to watch as projections of illuminated lines, forms, and patterns unfolded in fluid motion upon panoramic screens. The light shows were generated in real time using spotlights reflected off an adjacent basin of water or shone through a system of lenses. The visual compositions swelled and subsided according to the behaviour of the water or the properties of the optical instruments – some in gentle waves, others in violent trembling.