Large-scale sculptor Richard Serra is known for his enormous COR-TEN steel installations big enough for dozens of people to walk through and stand within. And now, one of his pieces from the last decade, Sequence, weighing in at 214 tons and consisting of 12 13-foot-high sections, is slowly being installed in the new wing of SFMOMA along Howard Street, and severely slowing traffic there as a result.

Matier & Ross are on the case, noting that the museum — which won't reopen in its new form until 2016 — has its trucks blocking off two lanes of Howard Street for four days this week as each piece of Serra's piece gets carefully hoisted and maneuvered into what will be the museum's new entrance hall.

A rep at the museum tells SFist, "We’re actually ahead of schedule and have finished early each day putting the Howard Street lanes back in play hours earlier than planned."

The sculpture will be on loan from the Fisher Art Foundation for the next five years, at which point the museum will swap it out for a different piece in this "admission-free zone" of the museum.

Sequence has been living in a courtyard at Stanford since 2011, and you can see a photo of it from above here. Created in 2006, it spent its first year of life as part of a Serra retrospective at the MoMA in New York before getting shipped to California and spending 2008-2011 at the LACMA in L.A. The figure-eight-shaped piece measures 67 feet long, 42 feet wide, and 13 feet high, and works almost like a maze that one can walk through.

The Fisher family (founders of The Gap) remains closely tied to SFMOMA, and they also own another enormous piece of Serra's that stands in the atrium of Gap headquarters along the Embarcadero. It's called Charlie Brown and stands 60 feet tall, and can be seen in photos here.

Related: SFMOMA Neither Confirms Nor Denies Reports Of Three-Year Closure