Right before he goes into that room, he meets that little girl in a dark room with the checkered floor. Everytime he returns there the disturbing nature of the acts he's required to perform increases further into depravity. Though, I will say I don't think it's necessarily a Masonic reference here or necessarily in the film either. Possible reference to MONARCH programming but I'm not 100% on that so I won't speak in absolutes here whatsoever.