How Do You Build A Sand Castle?

I don't know about you, but I love to play in the sand. Even as an adult there is something wonderful about sitting on the beach (or even the sand park) and creating a masterpiece. I however have always done this sitting, I think it takes extra special talent to build a sand castle while upside down. How do you build a sand castle? PS - I promise to you my readers and myself that I am going to work on my photo taking skills. Hang in there...I promise they will get better.