LIMESTONE – A building that breathes. Another outfitted with TVs in the windows. A catwalk that winds its way through a cluster of pine trees. A sign that makes suds. Roaming performance artists with helmets shaped like wing nuts and acorns. And one authentic Bob’s Big Boy statue.

Welcome to Sunk City, a collection of sights ranging from the fantastical to the truly bizarre that was the visual centerpiece of It.

“The idea was to create a space in which the exhibit, the crowds and the performers could interact and feed off one another,” said Kristina Birkmayer, one of three department heads for visual design who worked to create Sunk City.

Construction began in June, and continued even as the fans began to explore it. Anyone was free to wander in, out and around Sunk City, exploring its buildings during the hours the field was open.

Some marveled at the buildings and walked across the rooftops of the city on walkways and stairs. Others were wowed by the art installations that included a full-size car made of pressed foam suspended in the trees, thousands of balls of every kind scattered on the ground, a web of masking tape stretching throughout the trees, and many more surreal odds and ends.

“It’s amazing how they’ve incorporated into what was already here,” said Jessica Clark, 26, of Burlington, Vt., as she explored Sunk City on Saturday afternoon.

Many were amazed but perplexed by the performance of the wing-nut and acorn people who roamed the site. The troupe of performance artists called itself “Volley of the Nuts,” and was the brainchild of 26-year-old artist Abby Manock of Burlington, Vt. Manock said the group’s performance at Sunk City was tied to the exhibit’s, but is part of a longer overall project.

Shawn Landis, a visual artist from Seattle, Wash., was brought in to construct his project, a building with balloon-like windows that inflated and deflated and gave the appearance of a structure that breathes. Landis said he was impressed that Phish helped other artists by financing projects such as Sunk City at their festivals and getting massive audiences to interact with visual art.

“I think it’s pretty cool that Phish [is] willing to kick down to other artists,” Landis said Saturday. “Being a visual artist and showing in galleries, you don’t have this many people come to see your work. There’s no way you’d ordinarily get 60,000 people to an art showing.”