I don't know how many others round these parts are into the "games as art" thing, but I think a powerful artistic statement could be made with a FPS set in the trenches.
In my game a trench would faithfully recreated which the player given no objective but to explore and experience life in the trenches. After some time they're told to get ready to go over the top. They player can either go over and get killed after a few seconds or refuse and be shot as a traitor.
There would be no way of winning the game.
You mean the way the sea stays steady as a rock and the buildings keep washing up and down? Yes I thought that was odd.