On Tuesday, after a nearly two-month delay, Zaha Hadid’s pavilion honoring the 100th-year anniversary of Daniel Burnham’s plan for Chicago finally opened in Millennium Park. The wait—allegedly caused by problems with the project’s contractor—was more than made up for by the dynamism of the space, or so thought the Tribune. The installation at last joins its neighbor, the on-schedule Burnham pavilion by UNStudio, which is already showing significant signs of wear on its plywood surface from being used as a public rumpus room. See more pictures of Zaha’s creation here.