If you want to play around with slit scanning, I made this little toy a number of years ago and frequently find myself using it on trains:

https://slitscan.space

Press and hold your phone screen to switch between the front/back cameras, or hit "c" on a computer. Tapping the screen saves the image, as does "s".

I see a blank page with the tab title "S L I T S C A N S P A ...". Scrolling does nothing. What's supposed to be there?

If you have a camera and give it access to use it then it will work as a slitscanner. At least that's what happens on my laptop...

This was fun to play around with

This is super cool!