Copenhagen Gallery Windows

window n.

1. An opening in the wall of a building [...] for the admission of air or light, or both, commonly fitted with a frame in which are set movable sashes containing panes of glass.

Quite simple and rather dull. Fortunately, man likes to add some artistic decoration to his dwellings to make them stand out from others.

The photos here give you a good impression of how innovative man is even when it comes to something as utilitarian and common as a modest window.