Most Helpful Guy
It looks like a close up pic of a crack in some concrete. That's the best I can do. Can I have Most Helpful?0
Most Helpful Girl
It looks like a wedge in the ground or a spot between two rock walls. It seems like a place to put a water pipe. I don't know what the block in the center is for, but maybe it's just to ensure that the "walls" don't come together. For whatever reason there is supposed to be a gap there.
I don't understand why you had to go anonymous for this question...0