Board Thread:General Discussion/@comment-26517018-20150621031542/@comment-26298566-20150622125201

In my opinion that are the glasses of Grunkle Stan's brother from "Not what he seems".When he gets out of this machine you can see his face clearly for a time, and he wears the same glasses like on the Bill Cipher Picture.You can see this glasses also one more time in the episode "Headhunters".