Iouri Lotman, taking as a starting point the idea that the rapport with the sign determines all the codes of a given culture and their systems of classification, proposes a typology of cultures. His resarch has been received with little interest in France, to the extent that some important articles in which it is described have not yet been translated. This is surprising considering the interest in Lotman's hypotheses, which give a boost and a broader outlook to semiotics which it had lost in certain scholarly minutiae. It may also be held that this indifference is normal for those whose profession is to reflect on the sign, unwilling to consider their object as a relative entity subject to the contingencies of history and culture, but also refusing to recognize the sign as a concrete force in Man's life, capable of directing his knowledge and his exchanges.