In 1990 I experimented with double exposures, using my 35mm film camera. After taking an entire roll of pictures, I cranked the film back into its canister, leaving enough of the film protruding so I could re-load it.
I had some idea of the sequence of pictures I took during the first pass of the film. Although this knowledge guided my choice of shots on the second pass, I had no idea what the resulting exposures would be. I was composing the double exposure blindly.
I did get some interesting compositions such as the one below: