Christmas candy cane optical illusion?

Can you slice a candy cane in half without touching it?

What you need:
  • clear glass
  • candy cane or candy stick
  • water
  • oil

What to do:
  1. Pour water into the glass.
  2. Pour oil into the glass to make layer about 1 inch deep.
  3. Put the candy cane in the glass and rotate it. When you turn it, does the candy cane seem to come apart?

What's happening:
Water, oil, and air each slow down light a little bit differently. This means that the light bends a little bit where the air meets the oil, and where the oil meets the water. The result? A candy cane that looks chainsawed into segments.

From the book Candy Experiments 2 by Loralee Leavitt

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