In our earlier post on the new Google Maps satellite images, one of our amazing commenters pointed out this curious bi-plane on the roof of a building at 77 Water Street, and asked for help identifying it. Quick as lightning, another commenter found the answer on NYC-Architecture:

The biplane on the roof sculpture was designed by some guy named Rudolph de Harak and executed by the sculptor William Tarr in 1969 (thanks Jack Ryan). Apparently it's a full-size model of a WW1 Sopwith Camel, complete with runway. It was put there to amuse inhabitants of surrounding scyscrapers, notably the WTC.

Awesome stuff! [Related: here's another angle on the bi-plane, from WLL.]