A 3D display doesn't help much; being able to take advantage of stereo effects helps a little, since you can see it from multiple slightly different angles at a

A 3D display doesn't help much; being able to take advantage of stereo effects helps a little, since you can see it from multiple slightly different angles at a time (one per eye). But your retina is still 2D- you can't perceive 3D objects directly through the visual system, just 2D projections of them. A native 4D creature would presumably have a 3D retina that can directly perceive 3D projections of 4D objects and infer 4D structure from them like we infer 3D structure from 2D projections. Maybe a tactile display could improve things somewhat (though you'd still be lacking access to 3D-internal structure), but as long as you're going through the human visual system, it takes some significant effort to reconstruct the 3D projections and then go the extra step to inferring 4D structure, no matter how good your display technology is.