This extraordinary structure is one of a family of vent and escape shafts designed by the architects along the Jubilee Line Extension.   Although containing several specific functions such as air movement, plant and escape, the architectural approach is highly sculptural with forms intended to reflect these functions.  The architect judges chose this as the Architectural Design winner for these clearly expressed sculptural qualities, the radical approach to resolving functional problems and an extensive use of post-patinated copper cladding in response to its parkland setting.