Fun House, the latest exhibit in the National Building Museum’s annual Summer Block Party series, looks a lot like a house, right up until you walk inside. The all-white structure’s front door is like the mouth of a cave carved out of Styrofoam; the foyer ceiling is made of sneakers; the hallway is a tunnel of fabric streamers, and the roof is entirely missing from the back of the house.

The structure, created by the New York design firm Snarkitecture, looks like if the house in Pleasantville lived inside Eternal Sunshine of the Spotless Mind. The bold design is even more impressive considering it was originally supposed to look nothing like this.

“It was originally going to be a full-scale house that was completely finished,” Cathy Crane Frankel, the Building Museum’s vice president for exhibitions and collections, tells DCist. It took some back and forth with Snarkitecture and its guest curator, Maria Cristina Didero, to settle on the house-in-progress look. “I like this [result] for the National Building Museum because we are about the process of building, not just the finished product,” Frankel says. “It works for us.”

This is the fifth in the Building Museum’s’s block party series of instantly Instagrammable exhibits taking over the museum’s massive main hall. For this year’s design, Snarkitecture, which has created the last four block party pieces, has reimagined its previous work into what it’s calling a “comprehensive museum exhibition.”

Items big and small from the firm’s 10 years of work make their way into Fun House: The front lawn, for example, is a field of letters spelling out “Fun House,” and is inspired by Snarkitecture’s A Memorial Bowing, installed in Miami in 2012. The playroom contains what at first looks like a towering tubular sculpture, but is actually a reworking of the 2015 piece Marble Run. It comes with black marbles, so you can try it out yourself.

Indeed, much of Fun House is meant to be played with. There’s the living room piece Pillow Fort, a tower of soft grey blocks just begging to be climbed, or Playhouse in the backyard, a small fort that fits adults (I checked).

And yes, The Beach is part of it. Sort of. The massive (and massively popular) sea of plastic balls from Snarkitecture’s 2015 Building Museum exhibition has been moved to the suburbs, reimagined in Fun House as a swimming pool. There are ladders for climbing in, and lawn chairs lining the outside. There’s even a ball pit hot tub.

The Beach’s balls were donated to Dupont Underground for an art installation, and some of them have come home to the Building Museum: According to Frankel, roughly half the balls that appear in Fun House (about 130,000) were left over from Dupont Underground’s project. (Yes, they were cleaned.)

The house may feel as though it’s made up of many disparate elements, but is united by an all-white color palate. That’s one element Snarkitecture always insists on: Frankel recalls pushing Snarkitecture to introduce color to The Beach in 2015. “Their response was that people add the color to it,” Frankel says. She expects that to be true with Fun House, as well.

It’s not the only lesson the museum learned from The Beach. “Snarkitecture told us The Beach would change people’s behavior,’ Frankel says. She was skeptical at first, but they turned out to be right. “It was funny to see how parents would wade with toddlers in the shallow end, teenagers would jump in the deep end&mdashpeople behaved like they were at the beach!” Don’t be surprised, then, if your instinct at Fun House is to make yourself at home.

Fun House runs July 4-Sept. 3 at the National Building Museum. $16 for adults, $13 for children, students, and seniors