At first I thought the low shower head could be the work of a short plumber who was exacting his revenge on everyone taller than himself. I thought about this a bit, and I figured that it wasn't a very likely scenario. Additionally, it doesn't give people that happen to be on the short side very much credit so I have rejected this theory.
I did some searching on the internet, and it looks like some handicapped-accessible rooms actually come equipped with lower shower heads for greater accessibility. This theory sounded reasonable, but there were no other accessibility considerations in the room.
A low shower head could have been deliberate in the design of the room or someone could have just run out of pipe. This is just one of the random things that I have come across in my travels. I never know when something like this is going to pop up, and they tend to amuse me to no end.
If you have any theories on the matter of lower than normal shower heads, I'd love to hear them.
Pictured above is a towel warmer that I came across while I was in Russia. Basically, you have a piece of pipe that hot water runs though, and you hang your towels on it. Not only does this keep your towel warm, but the whole bathroom stays nice and toasty. I quite enjoy having one of these in the bathroom as long as I remember not to touch the pipe.