Architect and designer David Rockwell designed this playground where the 12-and-under set can be the masters of their own universe. The space's perimeter is a wooden runway in the shape of an infinity symbol. The area within is dominated by loose parts—mostly found objects, such as wheelbarrows, buckets, rope and large white sheets—and a truckload of foamy blue shapes manufactured by Rockwell's team. There is also an abundance of sand and water. Parks Department–trained "play associates" oversee the goings-on.