[PatrickHenry]

Is it that we are not able to sense the cosmic movement of which we are a part - or are we born with the sense and then subdue it?

I believe the "cosmic movement" is essentially free fall. We wouldn't be able to sense that -- except as the local absence of motion. If I'm wrong in this, I'm sure our resident experts will be pleased to leap all over me with corrections.

[Alamo-Girl]

Thank you so much for your insight!

You may well be right about free fall and cosmic movement. But isn't it the absence of a fixed reference point in the field of view that aggravates motion sickness?