I just found this video from the early 1950s, and I'm stumped: <a href="http://www.flickr.com/photos/selago/3791431762/">http://www.flickr.com/photos/selago/3791431762/</a> The first clip is Clepsydra, fine. At about 16 seconds in, it shifts to something else. Something erupting at a sharp angle away from a boardwalk, with a blue pool across from it, and a small brownish basin in the right foreground. The surroundings look like Lower Basin, but I sure don't recognize the features. David Schwarz