Hehe, we've all been hyperfocused on the difficult part of a task and missed the simple part before. The part you didn't have to think about because it was so simple comparatively...
I've had plenty of times where I was part way through putting all the parts into a computer case only to realise I hadn't moved out the old case and brought in the new case yet... was just so focused on the main puzzle.
If you didn't read "Job's done" in a Orc peon's voice, then are you really living life?
Zug zug.
I am willing to bet this was a student project and an ongoing point of derision for the students who got a C for at least measuring the angles correctly.
Idea vs Execution.
I was looking at the numbers, expecting to see them out of order or something like that. Then I saw it.
I feel like it's more likely that the door hinges got moved to the other side
Or it was malicious compliance
Maybe but if so it's a shame, so someone still failed.
Modern arrowslit with built in reticle
I like that the assumption is that this is an error, that the protractor was meant to be centered on the door so that the door could be used to show angles.
But it doesn't have to be a mistake. It isn't like the door is going to be useful for measuring much. This could just be decorative, a way to say "here's the geometry classroom"
If decorative, why not center it on the doorway?
Why not have it on a wall?
We'll never know, unless the person that did it comes to public awareness with a story :j