Sunny Heights: another blue window.

Ringo in the custom built Leisure Wing at Sunny Heights, mid-Summer o' Etc. The above pic one of Tammy's latest batch, but there, I think, the wrong way round. This was the extension to the extension, an odd little add-on behind the projector room, the point of which is unknown; but notice - it's a blue window.
John, o' course, had a blue window installed in the attic at Kenwood around this time (later, as we have seen, to be removed and then lost):


So what was it with the blue windows? Why blue? And why windows? Why, I ask ye? I, once again, dunno. (It may well have been nothing more than one of them doing it, and the other copying.)
From straight on, it seems there wouldn't be room for windows either side of the round one:


Yet from side on, there clearly is:


Odder.
Palpable nonsense.