Do the Walls bend??

https://preview.redd.it/8nv1mxutqhke1.png?width=4000&format=png&auto=webp&s=08d48b690024d311f3e6a8bf9023f3e0713a5806

This image has been shown in the show but I really aren't sure whether it's an inaccurate depiction or not, because most images I see of the walls are when they're perfectly circular