At one point in Cixin Liu's novel "Death's End", humans enter a bubble of four-dimensional space.
The author explains that, as their equipment is only designed for three dimensions, they are always one coordinate short and therefore cannot accurately measure any distances. Later on, they carefully approach a four-dimensional object, and it is said to first appear as a small dot for a long time, just to suddenly pop up right in front of the human expedition.
Why is that? If I imagine things one dimension below, a two-dimensional being might not see a three-dimensional object at all, but if it is visible (because it intersects with the 2D being's plane of sight), it certainly will not suddenly be much closer to the viewer than an instant before.
Does this make sense within the universe of that book, either there or later in the novel?
EDIT: To be clear, once they have entered four-dimensional space, the protagonists do not see just a three-dimensional slice, they appear to perceive all four dimensions for some reason, as is described, for example, in this passage:
One could see the interior of solids, such as the bulkheads or a piece of metal or a rock - one could see all the cross sections at once!