This reminded me of Scott Burnham's talk at The Story earlier this year. The idea of interacting with your landscape, playing with it, shaping it and watching the dynamics of the community change.
It has also made me wonder when the last time I played on a swing was. I might have to rectify that.
Update: I knew this reminded me of something but I couldn't find the reference yesterday. It's this. The Playful Spaces concept by Bruno Taylor that I learnt of at geekyoto years ago.