"If you want to do something nice for a child, give them an environment where they can touch things as much as they want."  Buckminster Fuller, 1972. 

"I am convinced that standardised playgrounds are dangerous, just in another way: When the distance between all the rungs in a climbing net or a ladder is exactly the same, the child has no need to concentrate on where he puts his feet. Standardisation is dangerous because play becomes simplified and the child does not have to worry about his movements."  Helle Nebelong 

"Children are a kind of indicator species.  If we can build a successful city for children, we will have a successful city for all people."  Enrique Penalosa, 2004

Nice Quotes from a great Playscape Blog