I usually take a few seconds to review each photo I take but also there are photos that I just take really quick and move on. This is one of them. I was going for the texture and strucutre of the wall stones; I was surprised to find that there is more than that!
Someone was walking behind the wall and his/her feet got caught in the photo through that opening. I think that added another layer to the photo. Imagine that opening empty, it’d be less interesting, don’t you think?