Welcome TMJ,
While I don't know what else you are noticing with DS, sensitivity is common with GT kids. Although sometimes in comes in kids that aren't GT. But clearly the gravitational pull discussion is atypical for a 2yo.
I had to laugh about the cookie being a circle though. My DS4 was the same way. He would get so frustrated when his cereal bar would break into 2 pieces because it wasn't a rectangle anymore. And he knew rules about not eating things when they fell on the floor and he would cry and get so upset if part of his snack fell on the floor (even if he had tons more on his tray). Interesting. DS4 has always been into shapes so if the shapes of one of his foods got distorted it would annoy him. At 4 (almost 5) he is pretty much over that...which is good. I remember thinking how odd it was at the time. Of course I found lots of things odd that make a little more sense now.
Hang on for the ride and let us know what the WPPSI reveals as well. That may give you some more answers and explanations.
