The Happiness Project: Eleven Myths of De-Cluttering.: "One of my great realizations about happiness (and a point oddly under-emphasized by positive psychologists) is that outer order contributes to inner calm.
But as much as most of us want to keep our home, office, car, etc. in reasonable order, it’s tough. Here’s a list of some myths of de-cluttering that make it harder to get rid of stuff."