This dissertation begins with a discussion of the rediscovery and rehabilitation of masks as tools of performance and pedagogy in Western theatre over the past century, considering the work of various theorists, directors, teachers and performers in whose work the mask occupies a significant position. Discussion then focuses on the development of the neutral mask as an object and as a paradigm of pedagogy for the actor over the past eighty years and undertakes a comparative investigation of the concept of neutrality as a performant state. The discussion takes in the teaching of Jacques Copeau, Etienne Decroux and Jacques Lecoq, and extends to the theories of Eugenio Barba, considering the possible parallels between Barba's 'pre-expressive' state and the state of neutrality which the mask assists to develop in the actor. The dissertation further proposes that the term 'performative liminality' is an appropriate term to adopt for this performant state, and makes this proposal with reference to the theories of anthropologist Victor Turner regarding the liminal state. The practice-as-research component of the project sought to investigate and document the various uses of the neutral mask and its application to the creative processes of the actor, and aimed to provide qualitative analysis and evaluation of the neutral mask when used in a developmental workshop environment. The dissertation contains a full account of the practice component of the project and details the processes used to investigate the neutral mask, offering analysis drawn from the inside experiences of the actors and the outside observations of the researcher. Within that analysis is a consideration of the neutral mask as a tool for developing the scenic presence of the actor. / Masters Thesis