Metal has unique properties that separate it from other material choices. For more than three millennia metal has been a durable, aesthetically appealing design element used for significant buildings. No substance has been as important as metal in the story of man’s control of his environment.
So important was the metal in human development that it gave birth to the Copper Age, today better known as the Chalcolithic. Man first used copper more than 10,000 years ago. For nearly five millennia copper was the only metal known to man, and so it had all the applications.