Just inside the door to the studio of the Brazilian artists Osgemeos is a self-portrait.

Spray painted onto the concrete wall of the old metal workshop’s entryway, the image shows the identical twins Otávio and Gustavo Pandolfo, 50, standing next to each other, hands at their sides and looking forward. They’re wearing colorful printed clothing, bags slung over their shoulders and baseball caps propped on their heads.

Their skin is the same shade of yellow as the other characters they’re known for throughout their art, a nod to the fact that they, too, might be from Tritrez, the fantastical world they explore in their graffiti-style murals, monumental sculptures, intricate drawings and vivid paintings that have for more than three decades rocked their native Brazil.

The self-portrait is just a snippet of what’s to come after passing through a small doorway at the back of the room that leads to a work space that allows the twins to create on an enormous scale. Here, preparations are underway for “Endless Story,” their first museum survey of work in the United States. The full-floor presentation will run at the Smithsonian’s Hirshhorn Museum, in Washington, D.C., from Sept. 29 to Aug. 3, 2025, using the circular museum and its outside gardens to showcase some 1,000 artworks, photographs and archival materials.

One of the brothers’ imposing sculptures, wrapped in black plastic so it can be shipped for the exhibition, hangs from chains on the sweeping ceiling and another is tucked away in a corner, a smidgen of what looks like a subway car visible.

Under the studio’s mezzanine sits a model of the Hirshhorn, miniature versions of paintings and a photo of the pair as teenage B-boys placed on tiny gallery walls as the brothers decide where they should go. Working with Marina Isgro, the curator, has been a massive undertaking — not only do the artists have to select pieces they’ve done since art became their profession, but they also have to comb through the thousands of drawings their mother saved that they did as boys. Some depict sketches of cars and fire trucks, while others are an attempt to explain to their parents the importance of Tritrez to their journey.

That magical world is also the focus of a solo exhibition at Lehmann Maupin gallery in New York. “Cultivating Dreams,” their sixth solo show with the gallery, runs through Aug. 16 and features 13 new paintings and an immersive installation, taking visitors through Tritrez, a dreamworld they first started drawing when they were just five years old.