The present invention is for more optimally performing recording and reproduction of stereoscopic video. The interfacing agent may include collagen, a hydrophilic polymer and a therapeutic agent. In particular, Type I collagen, for example, is first prepared by extraction from bovine or porcine hide and purified. Further, the method involves focusing, with at least one focusing element, the light beam on a second set of the solar cells according to a change in the current light condition. The method can further cause the computing device to weight the graph based on the retrieved information. Due to such a constitution, the agitated material suction passage formed in the inside of the agitated material suction guide cylinder can ensure a sufficiently wide agitated material inflow area.