Blue/purple glowing Illuminati/Bill Cipher symbol from the last episode of Gravity Falls (the symbol arrangement is different in the book/frame in the end of the intro)
Yellow/purple glowing Illuminati/Bill Cipher symbol from the last episode of Gravity Falls (the symbol arrangement is different in the book/frame in the end of the intro)
White glowing Illuminati/Bill Cipher symbol from the last episode of Gravity Falls (the symbol arrangement is different in the book/frame in the end of the intro)
Red glowing Illuminati/Bill Cipher symbol from the last episode of Gravity Falls (the symbol arrangement is different in the book/frame in the end of the intro)
Glowing Illuminati/Bill Cipher symbol from the last episode of Gravity Falls (the symbol arrangement is different in the book/frame in the end of the intro)