Walking as contemplation is a great way to take time 'out' in our busy lives in a way that is (mostly) considered a valid use of our time. I find it extremely sad that we are often so driven to look consistently busy that contemplation is seen as unproductive. Walking allows us to take the time to review, think, problem solve, while doing something physically good for us as well as adding to our mental and emotional well being. Next time you are sitting behind your computer stuck on a problem, get up, go out, walk around the block. And remember that the best solutions often need to mature just like good cheese. There's a reason why people say they want to sleep on a problem. But, don't just sleep on it, WALK on it!