Board Thread:Wiki-Related Discussion/@comment-25762747-20150310060211/@comment-6302057-20150418130340

With EF (technically FTL) being the 'anchor world' for the hat, this could be how part of it works: one uses the hat in FTL to access the portal of doors to travel to other magical worlds, however, if the hat is in another world besides FTL, as it was when it was located in SB, by default, it opens a portal to FTL. This is shown in "An Apple Red as Blood" and "Broken".