Line of flight
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A line of flight is a concept developed by Gilles Deleuze and used extensively in his work with Felix Guattari. In the first chapter of Capitalism and Schizophrenia: A Thousand Plateaus, which describes the concept of the rhizome, it is referred to as:
"Multiplicities are defined by the outside: by the abstract line, the line of flight or deterritorialization according to which they change in nature and connect with other multiplicities. The plane of consistency (grid) is the outside of all multiplicities. The line of flight marks: the reality of a finite number of dimensions that the multiplicity effectively fills; the impossibility of a supplementary dimension, unless the multiplicity is transformed by the line of flight; the possibility and necessity of flattening all of the multiplicities on a single plane of consistency or exteriority, regardless of their number of dimensions."
In Manuel De Landa's book Intensive Science and Virtual Philosophy, the Line of Flight is described as an operator which transcends the real and ascends to the virtual. It is used as a synonym with Deleuze's terms Dark Precursor, Desiring Machine and Quasi-Cause.