From the Shirtpunch.com's interview with the artist:
"Question: What inspired this design?
Answer: Skorp was watching Decoded about The Georgia Guidestones and was intrigued. We didn't think they were well known enough so we altered the idea to what you see now. Fun fact: Those are Skorp's hands in the design! We staged them with blue painter's take and a Magna-doodle in place of the stone/soap ;)"
About Shirtpunch.com: It's simple; ShirtPunch is your home for limited edition, pop culture tees... but there's a twist! We only offer one shirt every 24-hours, and they're always only $10.