Here's a great example of resonance in action!
http://www.youtube.com/watch?v=_RBwj3HUOi0&feature=related
The movement of the person's hands creates vibrations which eventually match up with the resonance of the bow. This means that each successive time the resonance is correct, the intensity of that driving force has a greater effect on the bowl and the water in it. When this effect is strong enough, we can see the water rippling and "dancing".
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