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Lesson ideas

KS23: Collect full-face pictures of celebrities and make two copies, one of which is on overhead transparency. Then cut each one in half, lengthways. Stick two right-side faces and left-side faces together. This reveals a different face from the original and could lead into a discussion of bilateral symmetry in humans and other animals, and radial symmetry in marine animals such as jelly fish.

KS34: We can be fooled in the way we perceive objects and exercises, and using optical illusions show how this happens. Junior texts, such as Spotlight Science (Nelson Thornes, pound;8.77) have simple, photocopiable illusions. Optical Illusions by Bruno Ernst (Taschen, out of print, but available through libraries), has more complex illusions, including photos of a concave face by Sandro Del-Prete, which the brain interprets as convex. Ask Jeeves for Kids ( contains explanations of how some illusions work.

Memory games are also useful, especially those that can be used to demonstrate successful learning and revision techniques. Try You and Your Mind: Students' Book (Longman, out of print, but available through libraries) for some simple examples.

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