It's no secret that I love Peopleware. Here's a little gem from it. If you haven't read the book, I highly recommend it.
In most of the office space we encounter today, there is enough noise and interruption to make any serious thinking virtually impossible. More is the shame: Your people bring their brains with them every morning. They could put them to work for you at no additional cost if only there were a small measure of peace and quiet in the workplace.
Tom DeMarco and Timothy Lister in Peopleware (p 67-8)