I have to admit this particular image has an element of serendipity about it.  Co-incidentally I made a comment about the serendipity only the other day.  To me serendipity is not about what we accidentally find to photograph but what we photograph accidentally – in this case, I really didn’t notice the chair was missing a leg when I took the photo, I was too busy trying to fit the subject into the frame in the confined space in which I was working.