20 Martin Place, Sydney, Visual Mock Up by G.James Glass and Aluminium Published October 29, 2013 at 1080 × 1620 in 20 Martin Place, Sydney, Visual Mock Up by G.James Glass and Aluminium ← Previous Next → The East and West are sheer face glazing, while the south has the glazing overlap. Often the vision and spandrel areas are made of different types or colours of glass to suit the purpose – aesthetic or structural.