As far as I understood it, yes, a black hole, or rather the event horizon around it, is perfectly round. The problem you describe is that you can’t see the black hole, as that is the whole point of why they are called black. What you can see though, is the light behind the hole that gets “blocked”, creating a seemingly literal black hole in space.
But that is not the whole truth, because you do in fact see the light behind it. Since the gravity of the hole bends space time around it and you can indeed see the part that is behind it, albeit distorted around the event horizon. What you describe as changing view from up or down is indeed just the different view behind the hole, not the hole itself.
As far as I understood it, yes, a black hole, or rather the event horizon around it, is perfectly round. The problem you describe is that you can’t see the black hole, as that is the whole point of why they are called black. What you can see though, is the light behind the hole that gets “blocked”, creating a seemingly literal black hole in space.
But that is not the whole truth, because you do in fact see the light behind it. Since the gravity of the hole bends space time around it and you can indeed see the part that is behind it, albeit distorted around the event horizon. What you describe as changing view from up or down is indeed just the different view behind the hole, not the hole itself.
the event horizon of black holes is not universally spherical. Rather, it can vary from a perfect sphere due to rotation or other movement.
https://en.wikipedia.org/wiki/Rotating_black_hole
True, thanks for the addition! I forgot to mention that.
Would the shape of the accretion disk also affect the shape of the black hole?