Ghosts at the West Branch?

The West Branch of SPL opened to the public on May 27, 1909. It was one of 2,509 libraries built in the U.S. with funds from Andrew Carnegie - the Central Library and East Branch were also built with Carnegie funds. The image here shows the adult reading room in the early 20th century, now home to mysteries and audiovisual materials. Wait, is that a ghost in the picture? See if you can find the double-exposure "ghosts" in the frame. More images (and more ghosts!) of the West Branch in its early days on our new Flickr album.