After two days of paper presentations and seminars at the Medellin campus of the Universidad Nacional de Colombia, a small group of faculty and students took a van ride to the Big Rock (El Peñol de Guatapé), about two hours northeast of Medellin. Along the way, we stopped in Guatapé, where Roberto Guerrero Pérez of Concepción, Chile, did this sketch of me drawing the view from a boat which was taking us on a tour of Represa Guatapé.

Later, I took a half hour to draw this view of the town square