We all have a natural tendency to spread our furniture and belongings out to fit the size of our homes. Like the nature of a gas to expand to fill whatever container it finds itself in, we always seem to find a way to crowd and clutter a room—no matter how large—if we don’t proactively organize it. Sadly, there never seems to be enough space. There are, however, a few tricks we can play on the mind to make a room seemingly double in size, and a few handy tools to unlock the hidden space in any room. [...]