Buildings That Wear Light Glass Suits
Modern skyscrapers do not rely on their outer walls to hold them up. These glass skins are essentially curtains that hang off the building frame, protecting the inside without carrying any structural weight.
Because these walls do not support the building's gravity, they can be made of incredibly thin and light materials like glass or aluminum. They are designed to sway slightly with the wind, transferring that pressure back to the internal steel skeleton. This engineering trick allows architects to create massive, transparent towers that would be impossible with heavy, load-bearing stone walls. It effectively separates the building's function from its aesthetic appearance.
Source: Curtain wall (architecture)