Visualization 1: Light propagation in a Penrose unilluminable room Takehiro Fukushima Koichiro Sakaguchi Yasunori Tokuda 10.1364/OE.23.017431.v001 https://opticapublishing.figshare.com/articles/media/Visualization_1_Light_propagation_in_a_Penrose_unilluminable_room/4948403 Short animation Originally published in Optics Express on 29 June 2015 (oe-23-13-17431) 2015-06-29 00:00:00 Visualization Penrose unilluminable room oe Optics Express propagation 29 June 2015 animation