I read about this technique here where it was used to look at stool samples on slides (fun!), but I mostly used it to look at color slides and other flat things. Below is a video of moving a slide photo of a building in front of the lens.
Step 1: Materials
- 3.0 mm ball lens
- double-sided foam tape (mine is removable)
- thin scrap pieces of plastic
- cheap retractable pen you don't mind breaking
Step 2: Make lens holder
With the hole made, place the lens inside and put a couple small pieces of scrap plastic on the side so the tape won't stick to what you put up against it.
And that's it.
Step 3: Look at stuff
The last picture is of my fingerprint. The line in the middle is one of the grooves of my fingers.