Subject: What is a complicated Physics Principle that can be Shown by a Photo?

Hi, I would like to take a picture of a Physics Principle, and I would like some
help.  I was thinking , possibly I could have a series of shots of an arrow
hitting a block of wood suspended from a long string, and show how far it moves,
but what do you think? I'd like something better.  These Ideas are to be for an
artistic photo contest (I'm goin to college next year), but it also has to be of
Physics.  Please help me (it could also be a pretty physics principle, as in
photogenic)  Thank you!

Re: What is a complicated Physics Principle that can be Shown by a Photo?