Have you ever play with a pinhole camera that is a simple camera without a lens and with a single small aperture — effectively a light-proof box with a small hole in one side.
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.