The LdoD Archive is a collaborative digital archive of the Book of Disquiet by Fernando Pessoa. It contains images of the autograph documents, new transcriptions of those documents and also transcriptions of four editions of the work. In addition to reading and comparing transcriptions, the LdoD Archive enables users to collaborate in creating virtual editions of the Book of Disquiet. It also includes a writing module which, in the future, will allow users to write variations based on fragments from the Book. Thus the LdoD Archive combines a representational principle with a simulation principle: the first is expressed through the representation of the history and processes of writing and editing the Book; the second is embodied in the fact that users are given the possibility of playing various roles in the literary process (reading, editing, writing), using the flexibility of the digital medium for experimenting with the Book of Disquiet as a literary machine. It was developed in the context of the FCT research project: “No Problem Has a Solution: A Digital Archive of the Book of Disquiet”.