A client had me put reproduction windows into the internal fanlights of his house. He was so pleased that he decided to have a similar thing done in a flat that he will be renting out. In this case I took the pattern in the bathroom window and adapted it slightly. My interpretation of the small mound at the bottom of that window is reflected in the door opening below the fanlight.
This window was installed by the joiners working on the flat. After inspection, I needed to add putty, as the panels had been installed dry, and so rattled each time a door was closed. Another lesson on the need for experienced people to do even simple jobs.