User blog comment:Afton24/My Theories: A Moving Eye/@comment-12784141-20130807115536

I believe that too. But that eye is called "The Eye of Providence" and it is the symbol of the F reemasons. The Freemasons are a secret society and one of the 12 cryptograms in "Rumble's Revenge" says that there is a secret society in Gravity Falls. The Eye of Providence appears on many objects in the shack and the rest of Gravity Falls, so I think we know what that secret society is... ;3