Read the glossary and check you understand the meanings of those words, then see if you can do these challenges!
1. Use the text to help you to write your own definition of optical illusion
2. Draw an arc
3. Write down or draw as many light sources that you can think of:
4. Use your careful looking skills to find the photograph on page 4 taken by Italo Melo. Find the horizon and show someone at home what the horizon is. Can you explain what it means?