As we are to a two dimensional image, so they are to us. Do extra dimensional beings exist?
Not sure that even makes sense. 2D images exist in a 3D world. We exist in a 4D universe (spacetime). I don't think anything can exist in just one of the dimensions; however many dimensions exist, we live in all of them. The only question is how many dimensions are we able to conceive/perceive, or else in how many dimensions do who choose to make an observation of something.
@spacearkdreamer - Got it, that does make sense; I even alluded to our ability to perceive higher dimensions. From what I read about the nature of higher dimensions, i.e. mathematical stuff that's beyond me, it doesn't seem likely to me, but can't know for sure.