Geometric sandcastles by Calvin Seibert
Seibert on his process:
Building “sandcastles" is a bit of a test. Nature will always be against you and time is always running out. Having to think fast and to bring it all together in the end is what I like about it…When they are successful they don’t feel contained or finished. They become organic machines that might grow and expand. I am always adding just one more bit and if time allowed I wouldn’t stop.