Double Exposure

Back in the days of film cameras you had to remember to wind on a frame before taking a photo.
If you forgot you got a "double exposre" which was usually a disaster ... but sometimes had some unexpectedly wonderful results.
When my mother-in-law went on a coach tour of Europe in the late 1950s she was very good at remembering to wind on, so when we scanned her slides we found only a couple of double exposures like this:


And then we stumbled across this gem from Venice:


That may need to be framed and hung in the living room...