A 100 years of protective elements in architecture
Buildings are mainly built out of bricks. To avoid clumsy people from running into the corners of these buildings steel guards are put into place. Now clumsy people can’t hurt themselves.
Concrete is taking over as a building material, but bricks are still used as a material in the facades. Drainpipes are considered the most valuable part of a building and must therefore be protected. Otherways clumsy people might run into them.
Steel and glass are now the predominant building materials. Sometimes the architecture of these modern buildings can cause people to hit their head in a steel beam though while walking, so scary chains are put in place. This way you can hurt your face as well while hitting your head in the steel beam. This will teach clumsy people not to text while walking.