Shadows tell us that light travels in straight lines. We can draw a ray (or streak) of light as a straight line on  a piece of paper.

Can you see what’s wrong with this picture?

If only our shadows could tell us what we're thinking...

This is a better shadow picture. Can you see why? When was it taken, in the morning or at night?

A sundial is a clock. Some people still use them in their gardens

It works as long as the dial is pointing the right way to start with...

As the sun passes across the sky during the day, a shadow is cast of a stick in the middle of a dial, which shows the time.

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