Changes

In 1955, [[Lacan ]] goes on to compare [[psychoanalytic treatment ]] to bridge, "a game for four players."<ref>{{E}} p.139, 229-230</ref>

In the same year, he describes a [[quaternary ]] made up of a triadic [[triad]]ic [[structure ]] plus a fourth element (the [[letter]]) which circulates among these three elements.<ref>Lacan, {{L}} 1955a</ref>

Other important [[quaternary]] [[structure]]s which appear in [[Lacan]]'s work are [[schema L]] (which has four nodes), the four partial drives and their four corresponding [[part-object]]s, and the [[four discourses]] (each of which has four symbols assigned to four places).

[[Lacan]] also enumerates four "fundamental concepts of psychoanalysis"<ref>Lacan, {{L}} 1964a</ref> and speaks of the [[sinthome ]] as a fourth ring which prevents the other three rings in the [[borromean knot]] (the three orders of the [[real]], the [[symbolic]] and the [[imaginary]]) from becoming separated.