The Brora sheep fold is how I guess most of TOC bunkers started out in life.
Some might argue that, but one thing to note about that one is that it's facing the "wrong" way for the hole.
It's on the downhill leading to a green on the inward nine, amd I assume it offers protection from the prevailing winds. It is, in fact, much like the bunkers on the 12th at TOC. They, too, face the "wrong" way and they offer protection from the prevailing wind.
The explanation in St Andrews is that they were ideal for the clockwise routing, but isn't it possible that they're that way because the sheep found them comfy?
Ken