Reach for the sky

This weekend, I noticed Owen reaching upwards with one hand. It's not a wave bye-bye up high, nor a reach like you reach when you're jumping trying to touch the rim of a basketball hoop. His palm is turned somewhat upward, and his hand - almost always his right - is a bit of a claw. It's as if he were going to pluck an apple. Or if the hand were lower, as if he were a Marvel villain, indicating his strength and plan for world domination with a simple gesture.

I had no idea why Owen was doing this. Carla pointed out that he does this when he hears a plane go overhead. (When he's outside, he'll also look up for the plane.) But that's not the only time he does it, so I think there's something else going on, too.