Cara and I love the NCMA Park and have walked it many times, but this last weekend we made a new discovery hidden within: the Cloud Chamber for the Trees and Sky. Basically a huge vertical camera, a pinhole in the roof lets the sun and stars shine through to the floor and walls of the small yurt-like stone hut. We went in the middle of a blazing sunny day, and were rewarded with brilliant laser-like sunbeams. Which we of course used to comic effect. So fun.