Back Office #2 deals with the fundamentals notion of indexation, sorting and representation of digital data. The ability to stock and translate information into discreet entities is a fundamental characteristic of the computer. The capacity to save mathematical operations to memory as well as compute them are consequently at the heart of the Turing machine, conceived and created during the Second World War. The computer as a principle upon which to base the organization of the world appears in the very long history of memory media (i.e. Michel Foucault’s hypomnemata): writings, maps, indexes, websites, journals, databases, online archives, blockchains, etc., all of which constitute so many attempts at inscribing the complexity of the real.