Expected to last between 50 and 100 years. When it's worn out, grind it up and use its material for another one. Or new pop bottles. Today this bridge grabs us. Forty years ago, crowds flocked just to see Big Brutus assembled from parts carried in on 150 rail cars.
Man loves change, newness, innovation.
Probably not much. We're better educated. The good of our technology means we live longer, have more leisure, live easier lives. Man's creativity hasn't changed everything. We still hate.