This is the first time I’ve come across this definition of a point. Geometrically point is defined as a zero dimensional shape (or something similar) if I recall correctly.
Besides, I don’t see how it’s intuitive at all! It isn’t to me at least.
Larger point being, if you pick such random domain without calibration you will run into such argument/discussions during an interview. Not sure what data point could be derived from such discussion when you are looking for someone who can write a decent maintainable code.
I must say that I’m terrible with geometry/graphics which hasn’t stopped me from creating value through software development in my domain, online payments.
If your intention is to gather signal for collaboration then I suggest picking something you are likely to collaborate on a day to day basis. Let’s say code review or architecture review. You could discuss why such and such an architectural pattern is useful, under what conditions, what are the pitfalls to watch out for etc etc.