Reefhood is a land art intervention. It involves installing groups of sandcastles on the seabed.Sandcastles are like bird houses. Some of the sandcastles will be placed in areas of degraded seabed near Barcelona. So they don’t move around, the sandcastles need to be installed at a precise depth. The installation process is straightforward, but the wind, waves and the weight of the castle all need to be taken into account. The castles are made of concrete by architect Michael Roschach.
Acid is applied to make the concrete more porous. This helps the invasion by mussels and algae. After a short time the castle will be integrated into the seabed. And after a few years the castles will disappear altogether.