If something lived in the 4th dimension and had 4th dimension perception, it could see us while we couldn't see it, unless it crossed into our line of perception?
Does any critter exist in only the 2nd or 1st dimension that we can perceive that cannot percieve us?
I would suppose that in the 1st dimension which would be a single point that it would exist only unto itself and nothing else. Much the same for the second dimension which is existence on a single plane within time and space. Any critter that existed on that level would not be the same as life or existence within the third dimension. Your image on a mirror is a single slice or picture of view on a single plane. If you could make a single layer of atoms reflect light and as thin as that might be it would still have the volume of the atoms and the second dimension has no volume. It only has a single dimension stretched out to infinity on a single plane or level of existence. It has not matter within it.
Only the third dimension allows for physical properties of atoms and particles in motion which than includes the laws of time and space and gravity and light and energy, etc...One could be philosophical and say that our spirit or soul, that which makes up our existence outside our body is a fourth dimensional existence. We occupy our body to exist and perceive the third dimension of creation much the same as our spirit puts on a glove. Our eyes, ears, body sense the third dimension but we have no sense to realize the full existence of forth dimension reality other than our mind and imagination.
That is the realm of God who is beyond the physical world. He can change the properties of matter at will. I would suggest that in the book of Genesis after the great flood God promised never to destroy the world by flood again. As a sign He created the first rainbow or prism affect. It would seem that rainbows or the ability to diffract light into a spectrum did not occur prior to this. So in an instance He created the ability to diffract light with water and thus changed the properties of matter and physics at His command by His will. IMHO