During a workshop with artist Tacita Dean in Spain, I decided to measure the coastline of Santander’s Bay in order to answer the coastline paradox, “the counterintuitive observation that the coastline of a landmass does not have a well-defined length”; smaller the scale, longer and more precise the length; different Atlases, different coastlines. Using the lenght and pace of my steps as a measurement tool, I walked for three days, from one end of the bay to the other, for 45 km. I later returned the experience into a diagramatic drawing, where existential notes coexist with data of the traveled path and my distance and elevation from the sea level. The film strips impressed the changing proportion between sky, coastline and sea and it is read as the melody of a music composition where the only constant tone is defined by the line of the horizon. A found object - a 1973 football betting chart where the magnetic stripe resembles the silhouette of a coastline and the grid dimension equals the one of the musical staff - endorses the legitimacy of the experience.