Retreived from http://www.thedesignwork.com/65-amazing-optical-illusion-pictures/ If Stones Could Speak: Unlocking the Secrets of Stonehenge. Determine what this picture illustrates and justify your response. Why do you think there is more than one way to view this illustration?
65 Amazing Optical Illusion Pictures | The Design Work
Retrieved from http://en.wikipedia.org/wiki/Jigsaw_puzzle If Stones Could Speak: Unlocking the Secrets of Stonehenge. What is the relationship between puzzle pieces? What would happen if one piece was missing?