Greimas introduced the semiotic square as a means of mapping the logical conjunctions and disjunctions relating key semantic features in a text. If we begin by drawing a horizontal line linking two familiarly paired terms such as 'beautiful' and 'ugly', we turn this into a semiotic square by making this the upper line of a square in which the two other logical possibilities - 'not ugly' and 'not beautiful' occupy the lower corners. The semiotic square reminds us that this is not simply a binary opposition because something which is not beautiful is not necessarily ugly and that something which is not ugly is not necessarily beautiful.