Concrete is hard in the literal sense; there's a reason they don't make mattresses from it. Concrete is hard in the sense that to do it well takes a lot of skill, practice, patience, and a dash of luck. I have been wanting to put this phrase on a t-shirt for many years, and it is finally happening. The only way to procure one of these beauties is to attend the May 2017 Workshops being held in Angels Camp, CA! We hope to see you there!