1 The technical data in this preface is based on a series of interviews with a
security surveillance company, who until recently worked as a senior developer of
algorithms for a leading international provider of security systems.
2 Michel Foucault had already identiﬁed this meaning of norm in his 1977 – 78 lec-
tures at the Collège de France.
3 Suicides are one of the main causes for delays in train schedule in the Western
world and preventing them is a high priority for public- transport companies.
4 Seeing movement requires very primitive calculation abilities, requiring virtually no
memory. It relies merely on the ability to compare images taken over short inter-
vals, annul similarities, and indicating change.
5 The surveilled movement in the description above, for example, is the “thing” that
differs (the substance that is either protected or is sought to be prevented), the
anchor for identifying differences (between passengers and thieves or travelers and
terrorists), the prism through which differences are articulated (that is, normality
as a pattern of movement). As a consequence of all these, difference is also con-
cretely produced by the production or restriction of distinct modes of movement.
Since movement enables differentiation between subjects on seemingly universal
grounds (the mode of shifting positions in space), it is summoned to justify dis-
crimination, exclusion, domination, and the use of force in liberal regimes.
6 We conducted a second interview shortly after the 2013 Boston Marathon, in which