Benera and Estefan
The Desert Rock that Feeds the World, 2019
Installation (phosphate rock, sand, metal wire), variable dimensions

The Wall of Sand in Western Sahara is the largest active military barrier in the world and the second longest wall after the Great Wall of China. The wall was built by Morocco to keep the Sahrawi people away from the region. The majority of the Sahrawi people no longer live in Western Sahara but in refugee camps across the border in Algeria. Western Sahara (an area designated by the United Nations as a «Non-Self-Governing Territory») contains a phosphate deposit of 1.7 billion tonnes on the Bou Craa site. Phosphate rock is formed over millions of years in the earth's crust and today is a finite resource. The deposits that account for most of the world's reserves are in Morocco's Western Sahara.
A Foucault’s pendulum is created from a phosphate rock, shifting its swing-plane according to the rotation of the Earth.

Photo credit: Patrick Hertzog/AFP