I was mostly being humorous, but I was doing it in a way that I thought might have some connection to reality, based on stories I've heard about friends' children (of widely varying age).

LOL, well described, that's how so often I say something, sometimes two often, but can find it difficult to convey.

I would have guessed that children observe moving objects generally *do* miss them -- eg. legs conveniently go round them, etc, and now expect that (not yet able to spot the exceptions of when the leg's teleoperator didn't see them, nor realising that it might be nice to take some of the responsibility).