A laboratory for experimental studies is a particular spatial environment to be appropriated by an individual. The way a subject will represent himself such a space will necessarily be affected by its specific character. This is here analyzed. The representations that the subjects will have are here considered as deter mining the way they will proceed to appropriate the space. This means that appropriation is consequent to the representation that the individual has of a apace. This relation is dialectic in the sense that the appropriation will naturally result in an influence on the individual's following representation of this space and so on. We raise here the question of the usefulness for the nalysis of appropriation of an experimentation in a laboratory. Experimental designs with the purpose of individuating the constituents in the appropriation process may be conducted in a laboratory if we concentrate on the analysis of the subject's represen tations and how these representations change. A laboratory offers here experimental conditions more easily controlled. The results can be of use for the architect. If we want to study the specific role of the spatial environment on appropriation it seems necessary to examine it in the individual's daily environment. This because in such a case the way the individual experiences his own condition in terms of power and as a consequence the influence he considers to have on the surrounding space becomes extremely important.