Getting back to routing, I had the pleasure of playing Bel-Air and Shadow Creek. Probably the most dissimilar routings you can find. While Thomas was forced to route Bel-Air from the topography, Fazio had a free rein, and yet there are interesting similarities and distinct differences.
I can remember every hole at Bel-Air, yet ask myself if that was 7 or 16 at Shadow Creek. Even with all of the changes, Bel-Air is a blast to play with all of the eleveation changes and canyons that the course winds around in.
Both courses have a certain rhythm which I think is the most important thing about routing. At Bulle Rock, every hole was a bear without letup, yet it retained that rhythm, although very difficult to maintain. Bel-Air and Shadow Creek allow breathers, particularly Shadow Creek which challenges you, but allows you to really enjoy, the golf, the scenery, the camraderie.
Bel-Air's breathers are much more subtle, for instance the 12th (the former Mae West hole) allows you a straightforward par four breather to be followed by a long Redan par 3 and a loooong par 5, followed by a looong par 4.
Shadow Creek starts with a bunch of easy par 4s then slowly builds to more difficult par 4s and 5s. Although I'm a long hitter, the par 5s gave me the most trouble, probably by not knowing the right line to take off the tee. The 16th is a bear of a par 5, but the 17th-a short par 3 into a waterfall and the par 5 18th past Steve Wynn's obscenely huge palace are both holes to make birdies on.
Is routing simply using the land, wind, sun, topography and elevation you're dealt with, or is it all of the above with an added sprinkle of rhythm?