The beauty of this easy project is that you can incorporate so many different art concepts. It could take 30 minutes or an hour.
Here are just some of the concepts I focused on (I have a variety of levels and needs so each class had a different focus.)
Cutting (fine motor)
Sculpture compared with Drawing
Most students created their own spiral line to cut, but I had pre-made lines for a few students who I know needed a little extra help.