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The event horizon for a non-rotating black hole is a sphere. I never learned about rotating black holes so not sure in that case - it might be an oblate spheroid. At the centre of the event horizon the maths says there is an infinitely dense zero-volume point.
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The easiest way to imagine a black hole is to imagine some food and then to imagine @hippy hovering nearby.
There you go, doesn't take any imagination.
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They're inherently 4-dimensional, that is you don't get very far without considering them as 4D objects described by GR.
For fun you can use different co-ordinates to map things out. And interestingly, within the event horizon every direction you turn to points towards the centre hence no escape!
frankenbike
Oliver Schick
Backstop
@dicki
for some reason i'd never visualised a blackhole as a sphere before, had always thought of them as 2D flat circle .... are they spheres ?
now even more confused
time to watch tonights bbc programme on them and the photo, to see whats what