"If you ever visited the beach as a kid, you likely remember packing damp sand into a pail, then quickly flipping it over and tapping it out to make a little sand castle. Mine were never very elaborate. Perhaps it was never really worth it to me to put a lot of effort into something that would last, at best, a few hours until the tide rolled in. Then again, never in my wildest dreams could I have created a sand castle remotely similar to any of these."