Photograph

Is There Something Hiding In This Photograph?

             

 

This photograph of the Boardwalk on the University of Illinois Quad seems fairly straight forward, an idyllic scene of campus on a sunny day. However, if you look very closely on the left hand side of the photo there seems to a faint outline of a person walking. Is it a trick of the light, a misprint of the negative, or perhaps something more ghostly in nature?