In short, systems of simulacra must be described with the help of notions which, from the outset, appear very different from the categories of representation: the depth or spatium in which intensities are organised; the disparate series these form, and the fields of individuation that they outline (individuating factors); the 'dark precursor' which causes them to communicate; the linkages, internal resonances and forced movements which result; the constitution of passive selves and larval subjects in the system, and the formation of pure spatio temporal dynamisms; the qualities and extensions, species and parts which form the double differenciation of the system and cover over the preceding factors; the centres of envelopment which nevertheless testify to the persistence of these factors in the developed world of qualities and extensities.