Mobile devices have therefore encouraged users to redesign old signs of instruction by attributing new meanings to them. They reflect on the processes involved in this activity and point to the fact that: “the danger to meaning [comes] from what is outside the sign {i.e., is neither the acoustic material used as the signifier, nor the signified concept the sign refers to}. In the moment of writing, the sign can always ‘empty’ itself…for here the general
conditions for a deconstruction of metaphysics based on the notions of writing and difference, and first arrived at through a reading of how the notion of the sign functions in the phenomenology, are explicitly stated” (Derrida,2006, pp. xii-xiii).