The biggest real estate development in US history will have a puzzling centerpiece

Courtesy of VisualHouse

The design for Hudson Yards' massive, interactive public centerpiece - which had previously been kept secret - was unveiled September 14.

The structure, part interconnected stairway, part tower, part art piece, will stand in the heart of the development's outdoor public space. Called Vessel, it is currently being referred to as a 'public landmark' by Hudson Yards developer Related Companies. And though that description may sound vague, it's justified - the design defies classification.

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Hudson Yards, the biggest private real estate project in American history, is currently under construction on the far west side of midtown Manhattan. The $20 billion project will include residential, retail and office space and span a whopping 28 acres.

The project is the biggest undertaken in New York since Rockefeller Center was built in 1936. And, like Rockefeller Center, which features a public plaza, fountain and iconic sculpture (not to mention the world-famous ice rink that takes over in the winter), the developers of Hudson Yards are making public space a priority.

Plans for the project's outdoor area will include more than five acres of plazas and gardens designed by landscape architect Thomas Wolz. The space will connect to the top end of the High Line, the popular park on New York's former elevated train tracks.

But the most striking part of the plan is the design for Vessel, which will allow visitors to climb nearly 150 feet into the air.

Take a look at the renderings.