Biplane on NYC skyscraper

 2007 03 03 Biplane2

Why is there a WWI Sopwith Camel biplane and landing strip on the roof of 77 Water Street in New York City's financial district? It's an art installation created in 1969 by Rudolph de Harak and William Tarr.

Link to Wooster Collective post, Link to NYC Architecture page, Link to older post at Google Sightseeing (Thanks, Lindsay Tiemeyer!)

UPDATE: The above photo was taken by Philip J. Hollenback when he worked at the adjacent 20 Exchange Place building. Link to Flickr stream