On a hot summer day, it's quite typical to see people making sandcastles along the shores of sandy beaches. Whether the constructions are large or small, simple or complex, this fun pastime is something that many beachgoers enjoy. Sculptor Calvin Seibert is someone who has taken this simple activity to a whole new level. He considers building sandcastles as "a bit of a test. Nature will always be against you and time is always running out."