When […] you are travelling by air from Salt Lake City [Utah, west of the Rockies] to Denver [Colorado, east of the range], the nearest view of the Rockies is not the best one. While you are actually over the mountains, you see nothing but a maze of peaks, ridges, gullies, and crags. It is not until you have left the mountains behind you and are looking back at them as you fly over the plains that they rise up before you in their magnificent order, range behind range. It is only then that you have a vision of the Rockies themselves.
Civilization on Trial, OUP, 1948