If you grew up near the beach — or just vacationed there as a kid — chances are you’ve made a sand castle. You may have even entered a sand castle-building contest. But we doubt you’ve seen anything like the work of Calvin Seibert, who shapes sand into impossibly sharp edges and smooth curves, creating geometric structures that both suggest modernist architecture and, in their surprising stairways, evoke the work of M.C. Escher. Click through for some of our favorite Seibert sand castles, which we discovered via Colossal, and visit the artist’s Flickr page to see more of his creations. … Read More