Visual clutter makes us very, very tense. It degrades both our mood and our mental performance and our ability to learn—it may even contribute to us eating in less healthy ways. If you have any doubts about that, take a look at the size of the audiences for television shows focused on helping people to de-clutter. The reasons that clutter makes us feel stressed are routed in our pre-history as a species, so you’re not going to be able to…