Unseen. Ahhh, this is a tough one no doubt. My viewpoint my be different from the others and on purpose I haven’t read the other comments.
The strongest nation on earth is our imagination. With this God given ability, it is possible to see in our minds whatever it is that we want or wish to see. Nothing is outside the confines of our imagination. I’m not even sure if imagination itself has confines. It allows us to visualize any and everything.
In conclusion, my10cents is with imagination, nothing is unseen.