The bookhas comprises three series made between 2008 and 2019: "Territorios Vacios", a series configured along eleven years of work (2008-2019) identified in a zone where the industrial and residential juxtapose; "Ruinas de Epecuén" are a 2011 series of photographs of the desolated landscape of Villa Epecuén (destroyed in a flood in 1985) and later abandoned and "Construir la memoria" the series that are part of the reflexive line in which temporality takes over photography but, in this case, there is a hybridization with a complex and multiple network of technological devices whose axis is determined by the web. In Ballester's series, absence is the recurring sign of these images; outdoors are the architectural structures or their ruins but also the helpless gestures of those who inhabited them. "The photographer (Ballester) is there and, in an almost archaeological sense, explores the ruins to connect them with our present.".