It is hardest to lose what was never found

When I was a kid I used to cheat at Battleship sometimes. What I'd do is keep track of all the squares my opponent guessed and keep moving my ships around to the remaining empty spaces. You'd be surprised how many misses it would take to eliminate every group of five contiguous squares, to just the extent my brothers and friends were surprised at how many rounds it would take to get that first hit on my aircraft carrier.

I am trying to tell a story whose moral is this: it is much harder to let go of something that doesn't exist than something that does. Things that actually exist have edges and locations. Ghosts cling to every cell and will take up residence in any space they can find. Made up things are even harder to sink than that tiny little destroyer I'd keep moving around until I'd win.