This article, following up an ethnological investigation made in 1975, in the Mootbeliard area in France, aims to show that the arrangement of furniture within an apartment is in great part determined by the relational system a social class fits into. The relational systems underlying the social life of blue-collar workers and of white-collar workers are indeed differentiated by the importance that the former grant to parents while the latter rend to be more detached. The result of this fundamental divergence is that blue collar workers are set in a relational system of a collective, predetermined (not chosen) type, presiding over the great stages of their life cycle, du ring which commeosslity plays a leading part. On the other hand, white-collar workers favor, for their part, a relational system of an associative type, where one chooses his friendships among one's colleagues at school and at work in order to share with them particular interests and activities. To meet the requirements of these two systems, the apartment's living-room tends to be organized differently in each case.