I’ve been working on this theory that arcs radiate out from a central energy point. If price breakes the arc it forms a new layer (just like an onion). It’s why the further you stretch an arc, the harder it becomes as you’re moving the right hemisphere away from the central point, therefore ruining the symmetry. If you leave the central point the same and just add an onion segment it seems to work every time. Here's a great example with Gold!!