The only things missing were the beach balls. Roseville Arts’ Blue Line Gallery welcomed renowned sand sculptor Kirk Rademaker this week to transform seven tons of dirt into one very impressive sand castle. Bearing trowels, awls and even a kind of heavy-duty drinking straw, Rademaker got down to work on Thursday. He’s slated to continue creating his piece through today; the public is welcome to come and watch. “This is such a social medium,” said Rademaker, a 56-year-old resident of Santa Cruz who has worked on sculptures for celebs and major corporations. The exhibit is part of Urban Art Meets Sun and Sand, which also features a chance to make some custom beach art of your own. For $2, visitors can purchase flip-flops and transform them into a piece d’art using supplies on hand. The exhibit runs through Aug. 29 at 405 Vernon St. Blue Line is open 10 a.m. to 5 p.m. Tuesdays through Fridays, and 1 p.m. to 8 p.m. Saturdays. For more information, call 783-4117 or visit www.rosevillearts.org.