On June 9 of 2002,  in the Goree Island, off Dakar, with the control of Joseph NDiaye, curator of the House of the Slaves, Plexus International started to measure and map the advancement of the sea erosion in front to the Door of No Return.  Then, the data and docuemntation were exposed at the Triangle of Art event, held in the old City Hall of the Medina of Dakar. The measurement was made by Egidio Grasso,Sandro Dernini, Assane Mbaye, Micaela Serino, Alberto Soi, Silvana Mariniello, Eraldo Ridi, Andrea Corti, Silvia Pellegrini.