The BEACH, an interactive architectural installation (a.k.a. a huge ball pit) at The National Building Museum, and it was so much fun! The walls, flooring, and furniture were all stark white, and the back wall was mirrored to make it look as if the monochromatic seascape stretched on forever. As for the ocean, it was made up of nearly one million recyclable translucent plastic balls. (Those balls are now being moved to another location to be repurposed as some sort of art installation. I can't wait to see what that's going to look like.)
this flickr album.
Kids obviously went mental over the whole thing, but it was a lot of fun for adults too.
You might remember that NBM put on The BIG Maze last summer, and I think they may have topped that exhibit with this one. It was just so cool and futuristic looking. I can't wait to see what they do next year!