Gerardo Murillo, better known as “Dr. Atl,” spent two years living on the mountainside of the Popocatépetl (Popo), a still-active volcano southeast of Mexico City. Popo and its pair, lztaccihuatl, are the most iconic symbols in the Mexican landscape. Here, Atl shows us an unusual perspective from the top of Popo: the triangular shadow of the volcano stretches out over the fields below, emphasizing their geometry. The artist painted The Shadow of Popo using “Atl colors”: mixtures of pigments, kerosene and wax he created to produce heightened color effects.