Utah, Colorado, New Mexico and Arizona (we didn't stop in the latter, though we were within miles of it) have the same heft and proportions. Their landscapes are bare, alien, even dangerous at times (see yesterday's post).
Yes, they have an atmosphere, so I won't take the metaphor too far, but there are similarities. They are near the outer edge of this continent, and are some of the last-explored places in the country. Their terrain can be hostile. Human effort appears puny in their vastness.
Returning from a trip out west, then, is more like falling back to Earth, finding one's self again on safe, familiar ground.