^That's very interesting! I've never heard quite that take on it before. I just dug through my old pics, and Mr. Irwin's analysis holds up ok for my guys.
Scout's is a smidge higher than his eyes and pretty geometric. I'd say he definitely focuses well, and is fairly aware.
His barn-mate, Rio, has a swirl that's at the eye-line, maybe a touch lower, and also pretty geometric. He's definitely duller than Scout, but he's a real busybody, always into things and making messes. He's also my bucket-pooper.
My first horse, Johnny, had a very oblong swirl, the low end about at eye-level, but extending way up toward his ears, almost jagged in outline. My dad often said that Johnny was ADHD. Pretty darn sensitive, always looking, tended to be more nervous.