We don’t typically associate city government and public works departments with conceptual artwork, let alone lasting collaborations. But for New York City artist Mierle Laderman Ukeles, who has been artist-in-residence at the city’s Department of Sanitation since 1977, her core creative inquiry centers around a radical shift in how we perceive art, who gets to experience it, and spotlighting the labor that happens “behind the scenes” to keep society running.

The focus of a new documentary, Maintenance Artist, which premieres this weekend at the Tribeca Film Festival, Ukeles’ remarkable approach to art-making centers ideas of upkeep and nurturing. In 1969, she published “MANIFESTO FOR MAINTENANCE ART, 1969!,” a proposal for an exhibition titled CARE, in which she outlined parallels between her experiences as an artist and mother with those of sanitation workers. She asks, “…after the revolution, who’s going to pick up the garbage on Monday morning?”

In the early 1970s, Ukeles performed a number of interventions drawing attention to labor and tasks that often go unnoticed in daily life, like “Washing / Tracks / Maintenance: Outside” (1973) and “Washing” (1974), the latter of which was staged outside of a former gallery in Soho. From 2 to 5 p.m. one June afternoon, she proclaimed that the area outside the front door was to be maintained as art, “normalized” again at 5:01 p.m. In a 1986 documentary short titled “Not Just Garbage,” she describes this early performance:

I started to occupy the area through this sort of repetition of maintenance, of cleaning, and people watched me and were afraid to enter the space. When someone would enter, or go into the gallery and walk across, I would wipe out their tracks immediately. I would follow them on my hands and my knees and wipe out their tracks right up to their heels.

In 1977, Ukeles was officially named the Department of Sanitation’s artist-in-residence, and her studio has occupied an office space within its building for decades. Maintenance Artist opens with historical footage of Ukeles introducing herself to sanitation workers as she began her more-than-four-decade tenure. The film then cuts to the artist and her studio manager, Catie J. Heitz, sifting through Ukeles’ archives to select work to send to the Smithsonian’s Archives of American Art.

“Mierle is not a very typical artist,” Heitz says. “She works within systems, with people. Sometimes you can’t see the work because it was performance—it was an ephemeral thing—but what you can see now is the paperwork that represents it.”

Ukeles’ work aims to illuminate the labor—and laborers—who play an immanently crucial role in keeping the city functioning on a daily basis, even though work like trash collection or street-cleaning is rarely noticed or lauded. “I desire to create a new kind of utterly public art, not in sealed-off, special places for the few, but art injected right into the city’s bloodstream of daily working life,” she said in an early statement.

Ukeles “has created art that deals with the endless maintenance and service work that ‘keeps the city alive’ — urban waste flows, recycling, ecology, urban sustainability, and our power to transform degraded land and water into healthy inhabitable public places,” Ronald Feldman Gallery says, which represents the artist. “Ukeles asks whether we can design modes of survival—for a thriving planet, not an entropic one—that don’t crush our personal and civic freedom and silence the individual’s voice.”

The first piece Ukeles completed in her DSNY residency was a durational performance titled “Touch Sanitation Performance,” in which she shook the hand of every sanitation employee—all 8,500 of them—and said to each one, “Thank you for keeping New York City alive.” That gratitude proved profound in some cases, as the interaction had lasting positive effects for some of the workers, who expressed how they had been harassed or humiliated while on the job in the past.

Several of Ukeles’ works transformed the fleet of New York City trucks and equipment into moving artworks. “The Social Mirror” (1983) covered a garbage truck in a giant reflective glass surface, mirroring denizens of the city back at themselves. “Snow Workers Ballet” (2012) coordinated hulking machinery into a choreographed performance, positioning hard graft in the limelight through the unlikely merging of industrial vehicles and elegance.

The Queens Museum was the first to present a major survey of Ukeles’ work in 2017, spanning five decades of her interrogations of feminism, freedom, crisis, and care. Beyond the conceptual or performative, Ukeles’ practice has always been social and community-oriented, prompting us to genuinely consider how we treat one another, recognize hard work, and, of course, define what art can be.

Maintenance Artist is directed, written, and produced by Toby Perl Freilich in collaboration with writer Anne Alvergue, premiering on June 8 with additional screenings through June 14 in New York. Learn more on the film’s website.