Artist Calvin Seibert (previously) recently completed a new series of his geometrically precise sand castles on the beaches of Hawaii. A professional sculptor, Seibert seems to borrow angular ideas from Bauhaus architecture or the flair of Frank Gehry. How he’s able to control the sand so perfectly is anyone’s guess, it certainly puts my traditional upside down bucket method to shame. You can see more of his work over the last few years here.