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[[Lacan]] begins to use a variety of graphs and 'schemata' at an early stage in his work.
Originally used as teaching aids, these range from teh relatively simply '[[schema L]]' illustrating the [[imaginary]] function of the [[ego]] in the 1966 pape on [[psychosis]] to the complex chart of the workings of [[desire]] (1960).
Perhaps the most familiar is the 'algorithm' which in 1957 replaces [[Saussure]]'s simple diagram of the [[sign]]
<center>---------<BR>arbor</center>
with the notation
<center>[[Image:SAUSSUREANALGORITHM.gif|200px]]</center>
This is to be understood as demonstrating that the [[signifier]] is above the [[signified]], and that the two are separated by a [[bar]] that [[resistance|resists]] [[signification]] and forces the [[signfier]] to [[slip|slide]] endlessly.<ref>{{L}} "[[The Agency of the Letter in the Unconscious or Reason Since Freud|L'instance de la lettre dans l'inconscient ou la raison depuis Freud]]." ''[[Écrits]]''. Paris: Seuil, 1966: 493-528 ["[[The Agency of the Letter in the Unconscious or Reason Since Freud|The agency of the letter in the unconscious or reason since Freud]]." Trans. [[Alan Sheridan]] ''[[Écrits: A Selection]]''. London: Tavistock, 1977; New York: W.W. Norton & Co., 1977: 146-78].</ref>
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