Apologies in advance if this question is too simple! I'm learning about non-Euclidean geometry & am wondering about how the practical visualizations work.
Quite often textbooks show diagrams where there's a triangle drawn on a sphere as an example of spherical geometry. My question is, if I got an actual ball and drew on it would that be an example of non-euclidean geometry? And similarly, is the attachted picture (of the Shah Nematollah Vali Shrine) an example of non-euclidean geometry and if not why not?
