http://www.govtech.com/products/Startup-Invents-Bench-Reduces-Air-Pollution.html
The CityTree structure is an amalgamation of sorts: a green, free-standing contraption that's seemingly part tree sculpture, part park bench and part skate ramp. Its verdant wall stands about 13 feet high, and its square face stretches almost as wide. Yet despite its peculiar form, the installation has purpose.