The ‘spiral’ in the 500 clue is confusing… I think this is a game about plotting lines on a map, so suspect the spiral is a maths plotted spiral, based on a line… probably a golden spiral to fit the golden bit of the book title. But it could just as well be a historic feature or a place. Any thoughts?
I think you’re right, a plotted spiral seems most likely to me too. There are quite a few clue images that suggest circles or compasses, which may also point to this. Isn’t there a golden spiral? Maybe the golden owl name is nod to using this sort of mathematical spiral.