Fence

This is a picture of the fence at my parents house. These holes have been in the fence ever since I can remember, and I remember as a kid I would pretend they were binoculars into my neighbors yard and we'd play games from them. But looking at them now, it's weird that the holes kind of have a pattern to them, with two smaller holes on the inside of the board, and two bigger ones on the outside. This "pattern" was evident in other places on the fence, but I couldn't show all of it on my camera phone.