A series of "never before released fashion collaborations" have been released this week by the New York office of international architecture practice OMA.

The studio posted five concepts on their Instagram account – in the form of renderings and videos – to celebrate the recent New York Fashion Week. The ideas, some of which went on to be built, include spaces for the public to watch fashion shows and flagship stores for fashion brands.

Perhaps the most striking design is a sunken platform which descends vortex-like into the River Seine. Stepped concentric circles create a unique space for fashion shows, with the audience depicted sitting on the steps while models walk around the rings.

Our series of never before released fashion collaborations continues in honor of #NYFW Catwalk studies conducted by@omanewyork in 2011

A photo posted by OMA New York (@omanewyork) on Feb 17, 2016 at 8:40am PST