Theatre's theory and practice is essentially connected to the spectator towards whom it is oriented and gives it its very justification: The theatre audience, which is not an obvious entity. "The gaze upon the gaze" will be examined through several points of view. We shall problematize the status of the gaze; we shall deal with the central role of the spectator in defining the medium and with the spatial location of theatre audiences as these are understood both historically and culturally; we shall discuss familiar and contemporary terms of reception theories, including the notion of aesthetic illusion; we shall mainly discuss options to apply the idea of the "emancipated spectator" through participatory models and radical cases.