The interior appears submarine-like at first, with its steep stairs, small spaces, and scattered nets of elastic rope. But submarines rarely have floors of mirrored steel and clear acrylic, nor do they offer panoramic views of Central Park and the Manhattan skyline. Perhaps “Cloud City” is a starship. Imagine a craft with multiple pods, and walls that are transparent, reflective, or left open to space. Argentine artist, Tomas Saraceno, created this intriguing structure of 16 connected modules that will reside on the roof of The Metropolitan Museum of Art in New York until November 4th. It is well worth seeing. Positioned at sky-level, but anchored to the floor, the site-specific installation is grounded and airborne, dizzying and disorienting, futuristic and fantastical.