As I just mentioned, projecting a four-dimensional scene
onto a two-dimensional surface, which is what happens
normally when you view, say, a tesseract on a computer
screen, compounds two distortions. Our retinae are
effectively two-dimensional even though there are two of
them and we visually
process the two images into a three-
dimensional scene.
If, however, we were genuinely four-dimensional beings in
a spatial sense but otherwise quite similar to how we
currently are, we would have effectively three-dimensional
retinae into which the four-dimensional scenes kata us
project their light. We do in fact have senses much better
suited to perceiving three-dimensional space than our eyes
and ears, namely proprioception and touch, and possibly
balance come to think of it.
Therefore, why not have a pair of VR tactile gloves plus a
visor to view four dimensions? The hands explore the
three-dimensional projection of the four-dimensional
object, just as the eyes explore the two-dimensional
projection of a three-dimensional one. It would work
better than just looking. Look with your hands.
Again, thanks to [jscott] for the explanation.