I think I'll file this one under 'Pre-conceived Notions'...
Imaging you are putting together a jigsaw puzzle. You don't have all the pieces, and you don't know quite what the puzzle is supposed to look like, but you have a general idea that it's a landscape of some sort. There is a hole in the sky portion of the puzzle, right on the edge, that you want to fill in.
Might you reasonably hypothesize that there is a blue puzzle piece with a straight edge, maybe behind a baseboard somewhere in your house? And say you're in your attic one day, and lift a box of old magazines and find a blue puzzle piece with the straight edge underneath, might you reasonably conclude that it fits the puzzle near the hole in the sky, probably somewhere along the edge?
Wow!
That is deep, man.