Many years ago, when I was fresh out of uni, I lost my job because of an open office; I was sitting relatively close to a bathroom and people kept walking past behind me - After 1 week this made me feel stressed and paranoid and I couldn't concentrate.
One month in, the boss asked me into his office and basically told me that I was unproductive and that "I'm going to have to cut you loose" - Being young, I thought there was something wrong with me but after working in several other companies, I learned the importance of the workplace environment.
If I ever get into a situation where I had to work with my back facing a large empty room again, I would start looking for a new job straight away. I feel shivers just thinking about it...