Italian architects Renzo Piano and Gianfranco Franchi and Englishman Richard Rogers deliberately left the building's service systems visible and color- red for the transportation, green for the water pipes, blue for the air-conditioning ducts, and yellow for the electrical system.
Red is for transportation, green is the water pipes and blue for the ducts for the air conditioning.
Italian architect Domino DiCocco and Liberace deliberately left the building's service systems.