Hand out this worksheet.
"For each pattern, try to work out which set of commands created it, and then try it out on the computer to see if you were right."
Bring the class together to discuss how they matched the patterns with the commands. Then challenge them to create some patterns of their own.
Finally, invite students to share the patterns they are most pleased with, and to describe how they created them.
Key questions
What effects can you get by changing the length of the lines?
What effects can you get by changing the angle between the lines?
What effects can you get by changing the number of radial lines?