Dubai is chock-full of impressive buildings, including the world’s tallest, but even in that company the Opus stands out as something extraordinary.

Designed by Zaha Hadid Architects, this recently completed luxury hotel takes the remarkable form of a glass cube with an eight-story void at its center.As noted when we checked in on the long-running project last year, the Opus rises to a height of 93 m (305 ft) in Dubai’s Burj Khalifa district and is reminiscent of the firm’s Morpheus Hotel in Macau, China. Much like that project, it’s not really one building at all, but two towers joined together.

“The Opus was designed as two separate towers that coalesce into a singular whole—taking the form of a cube,” explains ZHA. “The cube has been ‘eroded’ in its center, creating a free-form void that is an important volume of the design in its own right. The two halves of the building on either side of the void are linked by a four-story atrium at ground level and also connected by an asymmetric 38 m [124 ft] wide, three-story bridge 71 m [232 ft] above the ground.”