global_settings{max_trace_level 50}light_source{<-10,-7,-2>1shadowless}
union{box{-20,20finish{reflection 1ambient 0}hollow}box{-3,3}box{<-1,-1,-20><1,1,20>}
box{<-1,-20,-1><1,20,1>}box{<-20,-1,-1><20,1,1>}rotate 10translate 10pigment{rgb 2}}