While I was still working as a shop assistant, I developed in may spare time this interesting 3d personal viewer that used two digital photo-frames (very common at that time), an half silvered mirror, and some polarizing film, to see stereo JPGs in 3D.
Press / publications:
https://www.instructables.com/id/How-to-realize-a-Stereoscopic-3D-digital-photofram/
