; for the signifying chain by which the unique experience of the individual is constituted is perpendicular to the formal system on the basis of which the significations of a culture are constituted: at any given instant, the structure proper to individual experience finds a certain number of possible choices (and of excluded possibilities) in the systems of the society; inversely, at each of their points of choice the social structures encounter a certain number of possible individuals (and others who are not) just as the linear structure of language always produces a possible choice between several words or several phonemes at any given moment (but excludes all others).