The contractors who built the New Museum’s two-year-old, $50 million facility on Manhattan’s Lower East Side returned this week. Their task: lower the second floor gallery’s ceiling by 2 feet. The change order came from artist Urs Fischer, whose upcoming exhibition requires the museum to upend everything from its lighting to its architectural plans. Last-minute changes and delays have meant shipping thousands of pounds of metal sculptures by airplane instead of by boat, at the museum’s expense, says the show’s curator Massimiliano Gioni.