("All photos copyright © Callista Gingrich, Gingrich Productions, unless otherwise noted.")
As you can see from the above 3/4 "lost profile" view, the mighty hair helmet does, indeed, appear to be impressively orb-like. Time for the overlay to check:
Impressive! Let's look at a front view:
And with the overlay:
I'd say that's about as perfectly spherical as "human" hair can get. Well done, Callista!