Building sand castles, most people will tell you, is a summer pastime for children at the beach. But not for Paul Hoggard, Remy Geerts, Craig Mutch and Calixto Molina, who have turned sand castles ...

It’s soft, stretchy, and perfect for building a sand castle, creating shapes with cookie cutters, or just letting it ooze through your fingers. It’s the ultimate sensory play experience for kids.

Add articles to your saved list and come back to them any time. Many of us have built castles on the beach, but for this father-daughter team high-level competitive sand sculpting is hard work.