The goal is to design structures that are natural in appearance and function while also providing acceptable protection to coastal properties, combining the benefits of ecologically responsive shore protection methods with those of conventional armor‑stone revetments or seawalls.Natural self-protection by landslides was demonstrated in the early 1990s when, in an effort to stabilize the Lone Tree landslide 15km north of San Francisco, California Department of Transportation dumped excavated material including rocks and sediment sized from clay to large boulders down a steep cliff face, creating a massive artificial landslide.