Close horizon consists of knotted nylon nets onto which a large amount of Roses metal (an alloy with a melting point of 98°) has been melted. On a Western slope the nets are placed on stands just before sunset. A fresnel-lens magnifying glass catches the sunset and concentrates it onto the metal, which is placed in a wide funnel-shaped container, above the net. The metal melts onto and binds itself to the net.