Photo by Robert Collins on Unsplash

Play has a serious side, and it’s not just for kids. Even as adults, we continue to obsess over sports and games. Whether we’re competing or cooperating in play, it generally involves some form of social activity: We coordinate and synchronize with other people and we find great joy in the exercise.

Play starts very early in life. Even the act of act of “pretend play” which requires feats of imagination — e.g…