Sign of the times

A Flickr contact posted this picture of a sign along the road that says "SIGN." I chuckled at the postmodern meta-ness of it all, but was downright startled when a day or two later, I came in the front door of our library to see this sign up for all the world to see:


Signs of the time, or just signs of signs? This is truly an example of the much-discussed empty signifier, ain't it?