Urban Life Through Two Lenses
From ToolCenter
The Urban Life through Two Lenses online exhibit juxtaposes photographs shot in the 19th century with contemporary photographs of the same locations.
Once in the exhibit, clicking "Visit" brings users to a Flash application that shows the two images side-by-side, and from that screen the "Explore" link opens a [pop-up with another Flash app that shows the two images overlapped, with handles that allow users to pull one back to reveal the other.