[16a-A14-2]Ray Analysis for a Penrose Unilluminable Room Cavity
○Takehiro Fukushima1, Susumu Shinohara2, Satoshi Sunada3, Takahisa Harayama4, Koichiro Sakaguchi1, Yasunori Tokuda1(Okayama Prefectural Univ.1, NTT CS Labs.2, Kanazawa Univ.3, Toyo Univ.4)
