The Ghost Made of Glass: teacher key

Ghosts, grade 4 edition, written for 4th grade. A see-through ghost once walked a stage. Learn the glass trick, and look for what made faces, creaks and shadows.

Read the book. Print this page for the key.

Questions and answers

1. What did people use to make the stage ghost?
   • A drum and a mask
   • A big fan
   • A sheet of glass and a hidden actor (answer)
2. What does the audience see in Pepper's ghost?
   • The actor's reflection (answer)
   • A cloud of fog
   • A mask on a wire
3. Which brain area gets busy when we only think we see a face?
   • The area for sounds
   • The area that notices faces (answer)
   • The area for smells
4. What did sharper photos show about the face on Mars?
   • It is a mask
   • It is a cloud
   • It is just a hill (answer)
5. Why might a floor be noisier on a cold winter day?
   • Dry air shrinks the boards (answer)
   • Shadows fall on it
   • Wind turns the ducts

Words

• pareidolia: seeing faces
• reflection: mirrored picture
• shadow: dark shape