Following Bjarke Ingels Group's wildly successful BIG Maze last summer, one could only wonder how Washington D.C.'s National Building Museum would one-up itself this time around. Enter Alex Mustonen and Daniel Arsham of Snarkitecture, who envisioned the 10,000 square-foot indoor BEACH that opened on July 4 in the Museum's Great Hall.

Decked out in Snarkitecture's all-white aesthetic, the monochromatic installation has beach chairs and umbrellas on the "shoreline" and an "ocean" of nearly 1 million recyclable translucent plastic balls for visitors to "splash" in, facing a mirrored wall that creates the illusion of a vast expanse. The Museum commissioned Snarkitecture to design the giant ball-pit — which was first announced back in April — for the annual “Summer Block Party,” which consists of various public programming, exhibitions, and events.

'We see the commission as an exciting opportunity to create an architectural installation that reimagines the qualities and possibilities of material, encourages exploration and interaction with one’s surroundings, and offers an unexpected and memorable landscape for visitors,' Snarkitecture co-founder Alex Mustonen said in a statement. The Brooklyn-based practice is widely known for their eye-popping installations and cheeky product designs that teeter between art and architecture — all in stark white, of course. The BEACH is by far their most ambitious public installation in both scale and agenda.

The BEACH will be open until Labor Day on September 7, 2015.