Published in 1989, Sous couleur de jouer has become a classic of French-language literature on play and games. Its approach is as much about reflecting on the idea of play as it is about criticizing thoughts that are too quick to grasp what lies at the heart of the phenomenon, that is a lusory attitude.

The (re)publication in the Bibliothèque Idéale des Sciences Sociales (Bi2S) of the work of Georges Liénard and Émile Servais finally brings to the attention of the scientific community an unjustly unknown investigation.The new preface by Stéphane Bonnéry, underline its precursory character for the sociology of education and children.

Edward Sapir is undoubtedly one of the most important anthropologists of the early 20th century. Long before the development of structural anthropology, Sapir formulated the philosophy of structuralism and laid the foundations of a general science of behaviour.

Raffestin thus makes a major contribution to the social sciences as a whole by defining territoriality as a form of spatial mediation of social relations. The importance which he places on the degree of autonomy which exists between the perception and the construction of power relations is the expression of a committed geography.

Logic, mathematics and universal language brings together thirty-nine articles written by Louis Couturat (1868-1914) on the philosophy of logic, mathematics and language.

It took more than a century to The Aim and Structure of Physical Theory, the major work of Pierre Duhem in the philosophy of science, to become a classic.