We cannot even see a human spirit. The most intimate of friends cannot see each other's spirit and none of us can see God. Mortal men have seen visible manifestations which God used to reveal Himself to them and to communicate with them, as when God the Son took human form in a Bethlehem manger. But they have never seen Him fully in His spiritual being. There is no way they could.
Spirits are invisible.
Rather than spooking us out, that can be a very comforting truth. Because God is invisible, not only can we know Him, but we can know Him apart from our physical senses. We do not have to see Him or feel Him to know Him. We have spirits too, you see. God is spirit, but we have spirits housed within our physical bodies.