Last weekend, the National Building Museum in Washington, D.C., opened a 10,000 square-foot ball pit to the general public, and everyone cheered that, finally, someone made their childhood dreams come true.

The installation, called “The Beach,” is literally two massive, gallery-white pools, built by Brooklyn design firm Snarkitecture, filled with plastic balls that fully grown adults can actually play in. It is reportedly very large and very fun, and is accompanied by a few dozen beach chairs.