These are the optical illusions you've seen before - but then couldn't find again. What do your students see?

• Old woman or a young girl?
• Is this man playing a horn, or do you see a woman?
• Is it a woman looking into a vanity or a skull?
• How many faces?
• The face of Native American, or is it an Eskimo?
• Does the book open its pages so you can read them, or does it face away?
• Which animals?