Part of a set of components which may be assembled in all sorts of ways to create a wide variety of stone buildings from
simple farmhouses through posher urban terraces to more complex villas, hotels and even palatial manors without putting undue strain on system resources because the same basic units may be used again and again in various combinations.
Here's a different pattern of bay window. Once again it's double-ended, and although the unit is two storeys high, you can
also make it into a single floor version by lowering it, as shown in the screenshot, where it's seen in both guises on the building to the left, whilst the two faces are shown to the right.