Interesting idea for putting a play area on asphalt, concrete or hard soil in a temporary build. The tires and rocks can be removed, and the sand and rocks swept up. Interesting idea for day cares in urban settings without access to grass or soil.
Sue has gotten us a lot of wonderful, new, indoor gym equipment, but at this time of the year, I can't help but "Think Spring". Wouldn't it be fun to build something like this to put in the grass at the far side of the playground?!