An important chapter in Schiller's speculation on the concept of nature regards the verisimilitude of the artifice, and particularly of the theatrical representation. In "Kallias-Briefe", the ideal of a full stylistic maturity that can be practised in the treatment of the matter, finds a privileged expression in the figure of the actor and in his capacity of transferring his subjectivity to the interpretation of the role. The author of the essay further demonstrates how these issues are linked to the broader debate on the art of mime that interests the whole European theatrical culture in the second half of the 18th Century, which, in Germany, turns around the figures of Ekhof, Schröder and Iffland.