When we’re developing a space, we tend to think a little more about what’s under our feet than what’s overhead, but often not much more. The single best surface for any floor is hardwood stained a warmish shade with the grain shining through for all to clearly see—seeing wood grain helps us feel cooler, calmer, and more collected, which is good whether we’re hanging out with other people or trying to do something that requires lots of mental effort. Sometimes…