Downtown Bern, Switzerland. If you are moving away from a clock and look back at it, the light you see must catch up with you. If your motion is near the speed of light, the clock you see will be slow. Einstein recognized in this a clue to the flexibility of time itself.

You can EXIT to a page on history of special relativity (Univ. of St. Andrews)
EXIT to "Einstein Light" presenting special relativity (Univ. New S. Wales)
EXIT to A. Dogfrey's "Dummies Guide to Special Relativity"
EXIT to Wright's tutorial on relativity (high school math required)

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