Stereoscope.
https://cdn.masto.host/flxmastohost/media_attachments/files/113/392/316/809/143/334/original/9eebbee8ae817834.jpg
I've mentioned the kind of folks you can find if you start a #filmphotography club. Here's an example, from meeting before last: the theme was stereo, so Nick made a stereoscope out of an aerial photography scanner and fabricated the support bracket you see in the picture. I seem to remember that he made the stereo pair by shifting the camera between exposures.
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