My friend Sarah's daughter plays club soccer.  She's good-n-serious. Sarah took two weeks off to accompany her daughter on an "away" game.   Far away.  In Spain.  I'm sure she'll play well there.  But she won't be playing.  From an anthropological/psychological POV, "play" has a very specific requirement.  Play has no purpose.  As such, it has no place in present day schools, where the box labeled "A sense of urgency" is found on some teacher evaluation forms filled out by administrators when they do class observations.  And yet, as time spent preparing for, and taking tests seems to be ever growing,  time students are allowed to play approaches zero.  Though play has no purpose, it does not follow that play has no value.  Peter Gray makes this abundantly clear, as he is abudantly outraged by our not noticing what schools have become.