This was a pretty self-explanatory lesson, I thought, but I did this video to show you a little better about what an ellipse is. The toothpicks are the foci, and the two parts of the rubber band going from the toothpick to the rubber band and back to the toothpick is always the same. If the rubber band were smaller, the ellipse would be narrower. It would have greater eccentricity. Ditto if the toothpicks (or foci) were farther apart, but the rubber band remained the same.
Here's one that applies it to the Earth's orbit around the sun.
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