By extension of the double exposure technique, you can create interesting panoramic shots with Holgas and Dianas, simply by only advancing the film part of the way to the next indicated exposure. Without some testing and measuring, it's a bit of guesswork, and since they are rangefinders (small secondary lens is used to approximate the main len's view, like old point-and-shoots), there's more guessing as to how far to rotate. I've never got one perfect; most times there's frame that's way off like this one. Still, I like their charm.
-llg