An apparatus, method, and system, for holding a golf score card and a writing instrument. The line management device includes a line manager coupled to a support. Preferably, the jacket is a rubber compound bonded to the outer wall. The permeability of each of the vertexes of polygons forming the shadow rendering object is determined based on the position of the light source and the position and shape data of the object, and the game screen image is produced based on the permeability determined. The method includes cooling the superconductive cable core to the operating temperature after laying the superconductor cable, shortening the superconductive cable core relative to the cryostat, fixing the superconductive cable core at its ends; and mounting terminations on the ends of the cable core.