Terry is right, I have Taiwans, not Blues. I can't really say if the Blues are as arboreal as the Taiwans, but a guy in my herp society has a Blue and though he keeps it in a much smaller cage than I keep my Taiwans in, he's given it climbing branches and he says it's shown a marked preference for the elevated perches. I think a lot of keepers tend to keep most snakes colubrid or python in a kind of 'stock' layout which tends to be this rectangle laid on it's side.
Knowing that Taiwans tend to be large and highly active snakes, I chose to go for the vertical set up. This was also because the breeder I got them from said that they were more arboreal. I think this can be extrapolated to the other Beauty snakes because if you look at all of them they have very long tails. Their tails are longer in fact than many other ratsnake species and if you watch them moving through an arboreal set up you'll see just how almost prehensile those tails are.
Taking all that into account, I set up my cages with a variety of vertical climbing options with suspended hide spots and perches. The mesh cages have not been the best setup. They do tend to lose humidity and also they are more difficult to heat.
After a couple years of using this setup I've decided the shortcomings are too much to overcome so I'm going to make new cages with the same vertical orientation but solid sides and front. Since it will be such a large cage I will however incorporate very large ventilation panels into the sides as well.
I think when it comes to housing Beauties since they can be largish snakes, particularly the Taiwans and the Blues you can certainly try something a little different. There are some keepers I've seen who keep them in more horizontal instead of vertical setups and they seem to do okay. However, I am big into naturalistic setups [especially working at a zoo], so I would advocate giving as much space as feasible to an active snake, particularly a big one.
-----
Matt Campbell
Animal Keeper, Small Mammal/Reptile House
Lincoln Park Zoo Chicago, Illinois
Assistant Curator
Wildlife Discovery Center at Elawa Farm
Lake Forest, Illinois