A sculpture by Philadelphia artist Jordan Griska installed in 2011 for the newly constructed Lenfest Plaza.

Grumman Tracker II was a 45-foot-long cold war era Naval plane with a 73’ wingspan, used to bomb submarines. Griska obtained the decommissioned plane and folded the metal of the nose and body of the plane so that it appears to be crumpling into the platform. In addition, he turned the existing sections of the plane into working greenhouses, leading to the name of the piece – Grumman Greenhouse.