Check out this finished "math playground" that was built for school children in Uganda. It's a very cool concept.
Project H designers Heleen De Goey and Dan Grossman have completed the construction of the first Learning Landscape math playground at the Kutamba School for AIDS Orphans in Southern Uganda. After nearly 3 weeks on site, they have finished the grid’s construction, and have been tirelessly working with the teachers and students on the implementation and adaptation of the games: “Around The World,” “Match Me,” and others, which teach elementary math concepts. The playground even integrates a bench system for added functionality as outdoor seating or assembly space.