Adventures of an Art Teacher: 2015 Bottle Cap Murals
crafts-kids-recycle-bottle-caps-michelle-stitzlein (11) Wow! These are all recycled bottle caps.
Painted Cardboard Shapes
Easy way to make a teeter totter with natural materials
#defender Series III
Batiment mirrored building by Leandro Elrich. A gigantic tilted mirror reflects the huge building facade laid out on the floor, where people can pretend they are hanging from ledges or make like Spiderman and crawl up the 4-storey house.
I think these could be re-created with PVC pipes for the backyard - The Imagindation Playgrounds sound garden full of red piping materials with yellow horns.