Life with computers has changed the way we see and think. A thorough understanding of the import of that change is difficult to attain. We tend to focus on the epiphenomena rather than the deep structure of computational culture. We are immersed in brands, in products, in the spectacle and the experience mediated by computers and screens, but we rarely consider data as such, or what a system is. And yet, data and system are the concepts that affect our way of seeing and thinking and make them radically different after the recent ubiquity of computers.