After Image

Copyright 2000 Teaching Treasures™ Publications

An after image is something you'll see after you have stared at the same thing for a while.

Stare at the fish with the red background without blinking until the picture changes. Keep looking at the fish and you will notice the fish and the background change colour right before your eyes. In reality the fish and background changes to a white card but your eyes have been tricked by an illusion and you see a light pink fish and the background is pale blue.


After image of a fish


Make your own fish illusion, after-image.

  1. Draw a fish like the one above on a white piece of paper.
  2. Make an identical copy of your line-art fish picture.
  3. You should have 2 the same pictures. (You can trace another copy by hand or use a photocopier.)
  4. Colour the background red of one of the pictures and blue eyes on your fish.
  5. Leave the fish white.
  6. Glue the 2 pictures together using a little paper glue along one edge so you can easily flip the coloured picture over.
  7. The coloured picture should be on top of your black and white line-art picture.
  8. Follow the simple steps for an after-image effect as described above but take note that you must stare for at least 10 seconds at the coloured picture before quickly flipping over to the second picture.


Copyright 2000 Teaching Treasures™ Publications