It can be easily made with an empty pringles chip can
(See how to make it on http://www.exploratorium.edu/science_explorer/pringles_pinhole.html)
Now you can have glasses with poinhole lens and see the twirling images in an easy and fun way!!!
Here is our upgraded version of the pinhole lens.
Material needed: 2 pringles’ pinhole lens cams (see last posting for the instruction), ruler, tape, unused big glasses frame, cutter, empty box (here we used shoe box), fabrics for cover.