This paper aims to reconstruct the eighteenth-century discussion about knowledge, and its connection to a new kind of acting. Mise en scéne, that is the collective and negotiable creation of meaning in theatre, will be at the core of the following pages. I will examine the eighteenth essayists who redefined the body as a readable text and senses as useful tools for understanding others, participants in the process. Metatexts, engendered by both the dramaturgic text and its staging, will demonstrate how these essayists orientated acting and theatrical reception. Key-words around which the main concepts have been developed will be considered as markers of the pervasiveness of the discourse on passions and sensibility in many literary and perf...