The physical remains of this post industrial activity can be viewed as an unofficial document chronicling the on going cultural change of use and meaning of such sites. It becomes an unexpected [and uncontrolled] addition that further facilitates the interpretation of the sites transition from work place to one of leisure. Each of these groups substantially enriches the interpretation of the historical sites they occur in. The particular way in which they do so is both subtle and extreme. Some are hard to ignore, some now barely noticeable at all.