This paper approaches theatre performance as a laboratory for the simulation of behaviour. The preparation of the professional production of a theatre play was observed and videotaped with the purpose of studying (a) the process of production of artefacts for giving sense to the play and each of its scenes, (b) shaping the identity of the characters, and (c) how these artefacts were reshaped and readjusted in successive rehearsals. Results support the thesis that the process of production of a scenic text can act as a simulation model for how cultural artefacts, conscious processes and behaviour get articulated when developing a character's identity.