US-based IwamotoScott Architecture has designed a mixed-use skyscraper in New York, US, as part of an economic study for Greenwich South.
Commissioned by the Downtown Alliance, the project study was led by ARO, Beyer Blinder Belle and OPEN.
The spiralling structure is located on a 41-acre site directly south of the World Trade Center site, near Edgar Street.
The sustainable building is clad in an environmentally modelled skin, which offers optimal solar shading and wind resistance.
It also features solar-powered fibre-optic day lighting, and bio-filtration terrarium floors within dual-branching atria, which act as a pair of lungs to provide fresh air.
The building's two bases on the lower level join briefly in the middle before slowly branching out into two atria.
The bio-filtration terrarium floors are located in the second split and feature open gardens, while the light-transmitting fibre-optics transmit daylight during the day and night, according to inhabitat.com.
The 1,300ft towers will feature retail and commercial spaces, a branch public library, a rooftop sky lobby and civic spaces.