This is the picture that took me four days before I was able to post. The approaching silhouette is that of the guard who I thought would restrict me from snapping shots of the entrance of the Light Expo. Guards here in the Philly are notorious for flagging down photographers, maybe sometimes just for the heck of it. "A permit is needed," as they would often justify.
I hope to get in the expo on its last day tomorrow, for free, courtesy of one of our partners here in the office.