our solar prism is located at the middle of the milky highway faces
prism is not polyhedron. southern_blue_flag is iris. prism is not optical_device. prism is polyhedron. erecting_prism is prism. prism is optical_device. triangular_prism is prism. quadrangular_prism is not prism. quadrangular_prism is prism. triangular_prism is not prism.