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.
Willow Tunnels can be really exciting - especially once established like this one.
sensory cosy garden--- I so want this for my kids at home and at school
Sensory Garden. A long term project which would be a staple element in the kindergarten. Focus could be directed to this garden during outdoor 'free play'
sensory garden water feature - Google Search
Channeled flume logs for children's water play.
Entrance to a playground.