Do ut des (2009) is an ongoing series of books that Castillo Deball has altered with perforations, starting from the front page and working inward, forming symmetrical patterns when each spread is opened. The books belong to O Mundo dos Museus (The World of Museums), a collection conceived by the Brazilian designer Eugênio Hirsch in the 1970s. More than simply a catalogue of artworks, each offers the reader a promenade through a different world museum and its functioning, starting with photo reportage of the building, its urban landscape and architecture, the management and restoration of works, and visitors walking though the galleries. Collaged images of people alongside artworks indicate the works’ dimensions in relation to the human scale. The act of drilling into different institutional representations is a direct intervention into history itself, inviting us to question its representation.