Maybe we aren't supposed to look at the trees on the parchment at all since the parchment is a tease. Like Alex wants us to spend sometime puzzled by the trees and when he gives us a hint, it's that it has nth to do with them. Could be literal trees at a location or metaphorical trees (family tree, pines)? 'Beginning' could be where GF started or where it was first conceptualised? Idk... Hoping this will help ppl brainstorm.
the idea that “at the beginning” could mean either 1) where Gravity Falls “began” (which is a debated topic) or 2) something to do with the Pines family tree has been discussed, yep, but with no solid conclusion. here’s the other thing with the latest clue:
RETURN TO WHERE IT ALL BEGAN / THE FINAL PIECE IS IN YOUR HAND / THE PARCHMENT CAN BE SUCH A TEASE / THE ANSWER’S WRITTEN IN THE TREES
this is what was written on one side of the latest clue—which was the physical corner of the digital image that made of the first clue. because that riddle was on the physical clue, it sounds like the first two lines are speaking to the clue holder, telling them to return the corner to the original image. so that might be all those lines indicate. but! we haven’t ruled anything out for good. places connected to the other two interpretations are being considered.
something could still be up with the riddles, though, so if you think of any other interpretations, let me know. thanks for the message! it is a brainstorming party here ∆