Eben Goff

Coast / Pole took place during two trips to the North Olympic Coast of Washington State in 2002 & 2003. Driftwood poles were collected on site. As soon as the morning's high tide began to recede the logs were set one at a time vertically into the sand or rocks at even spacings along the water line. The number of poles used in the configurations varied from around 30 up to 100 poles. All constructions washed away under the following high tide. 

here 

Also, flood cubes.