Why does my ceiling look uneven, strange illusion


So my ceiling is indeed level or flat, but when I look at it in a 3d manor, the farthest away edges are extremely elevated, it seems to do this with the walls too. Its quite off putting, does anyone know why? mabe I have an off setting


Probably because the glass material is simulating refraction in a game engine way ie. not necessarily physically correct in order to be efficient enough to keep fps up.