
What is the purpose of this rotated window?
A few years ago I was biking around Berlin and found this unusually placed window. I know enough (very little) about architecture to think "well, that's not distributing weight correctly to be functional so I guess it's a little architect's joke, haha, only in Berlin" and so on.
The other day I randomly came across a picture of Aarhus cathedral, not going to link a picture here but easily googleable, and you can see the same thing, arched windows rotated 135 degrees dotted around the high reaches of the exterior.
Googling around wasn't able to confirm the purpose so I ask here, why is this a thing? And is it only contained to these two buildings, or was it a wider practice?
My only guess of what it could possibly be for is casting a light onto the floor, that when taking into account the angle of the sun the shape of the shadow is then orthogonal to the walls at a particular time of day that is meaningful. Which seems insane, but that's all I've got.
Please, if you know the answer to this let me know, or if you have a good guess (but let me know you're guessing so I don't spread incorrect explanations!) Thanks