Adjustable Speed, Frame-grabber Spinner

This one would keep you fidgeting forever. With this spinner, you can adjust the rotation speed once started, by expanding or compressing it or making it taller or shorter (search about rotational inertia, momentum). If you push it flat, it works like a regular spinner, but you still have a rotating window through which you can see. This window lets you "freeze motion" capture a rotating part, such as a fan, or a multiplexed display, such as a LED clock or an old CRT TV or whatever that moves in repetition or a rotation at certain speeds. You can achieve this looking through the windows in the disk when rotating and adjusting the speed of the spinner. You can tape one or two windows to vary its "capture speed." This one took me a bit too long and seemingly two others submitted variable speed spinners before me, but the idea was in my mind before those other were submitted.