And when an architect has designed a house with large windows, which is a necessity today in order to pull the daylight into these very deep houses, then curtains come to play a big role in architecture.
None of us has invented the house; that was done many thousands of years ago.
If architecture had nothing to do with art, it would be astonishingly easy to build houses, but the architect's task - his most difficult task - is always that of selecting.