The article Theatre in 27” Century - Towards New Definitions deals with the problem of narrow understanding of theatre art that dominates not only common thought but also the scientific practise of Polish theatrologists. This traditional definition is based on five elements: theatrical illusion, close connection with drama, dramatic character, stage box and space/time community between actors and spectators. During the development of the theatre in 20,h century this distinctive features were disproved by the reformers and experimenters. At the same time such theatre categories as performance, role, stage etc. were widely used to describe "theatre of everyday life". In the last decades of the 20th century the new field of science - the perfo...