Comparing Playgrounds to Play

I’ve been thinking about why I’m discontent with today’s playgrounds. When I want to explore and idea I often make up a list.  Here’s one that looks at this idea:

Playgrounds	Play
Fixed	Moving
Neat	Messy
Exciting	Engaging
Play on	Play in
Expensive	Free
Park or schoolyard	Anywhere
Safe	Challenging
Created by adults	Created by players
Drive to	Here and now
Manufactured	Emergent
Age appropriate	Inappropriate

Can you think of other contrasts?