User blog comment:ArtRebel/Theories/@comment-5525778-20130715200534

i have some other reasons i beleive that old man mc gucket is the author of the books. First off, he wears the bandage to cover up his sixth finger. And i want to point out that he created the gobblewonker so possibly he created all of the monsters. Then, one day he forgott that he created the monsters because he's mad. So, he starts writing journals about the monsters and other stuff he created. Then, he hides the books because he finds out that someone (I think Bill Cipher, because Bil seems to know everything) was watching him. Where would he hide the books? In machinery, because he is an inventor. Dipper finds the book in a METALLIC tree and opens it by a button. But remember, Dipper pressed two buttons. One opened the tree but the first one did nothing. I think that the first one unleashed all the monsters. That is all proof that Oldman  mcgucket is the author of the books.