The nice thing about computerized "tweens" is that image one can be a tiny red circle and image 2 can be a large green square, and the computer will gradually morph them from frame to frame.
Here is a sample video:
Over 100 years ago "arcades" were full of machines that people would put coins in and look through the viewfinder as they turned a crank which would flip through a series of photographs on a big spool. More modern examples of this technology is a "flip book". Typically these are done by rapidly flipping through images to create the illusion of motion.
Here's a great example of using Post-It notes to create a flip book movie:
Here's an example of animation using a MUCH slower "frame rate": http://www.youtube.com/watch?v=783uWoSqdX0
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