It would be a sad day for us all if the International Play Association couldn't come up with interesting speakers talking about play, but it isn't..... a sad day, I mean. And let's face it, any organization that's main concern is to promote children's right to play has got my vote.
Professor Jaap Doek talked about important aspects of play in a keynote address, titled "Children and the Right to Play", at the IPA conference in Hong Kong in 2008.
".....play was then and still is today a free activity; if the activity is enforced it is not “play” anymore. Play is also an activity different from the common or real life. It is an activity with its own purpose."
But don't let me spoil it by paraphrasing.... read it yourself. Why not check out the rest of their website while you're there.