One Canada Square Canada Square was completed and open for business. His Royal Highness The Duke of Edinburgh officially opened One Canada Square on the morning of 26 August 1991, and unveiled a commemorative plaque at the entrance to the building. Hundreds of construction workers attended the opening ceremony. The Duke of Edinburgh addressed some 800 invited guests, many of whom had been involved in the project. He spoke of the "large, airy space and clean, efficient office layout", as he declared the building ready for business. The attendees heard a specially-commissioned piece of music performed by a 30-strong choir. Paul Reichmann, Chairman
Centre Square (building) works of contemporary art. Until the company left in the mid-1980s, Arco Chemical Co., whose headquarters was in Centre Square, had a large collection of contemporary art displayed throughout the complex. Philadelphia has a percent for art program, which requires that a percentage of construction costs be allocated for art. A fan and collector of contemporary art, developer Jack Wolgin had three pieces commissioned to fulfill the ordinance. The most famous piece is Claes Oldenburg's Cor-Ten and stainless steel sculpture, "Clothespin". Located atop the subway entrance in the plaza in front of the building, Centre Square is best known because