How can computer intelligence best be employed in the theatre? Imagine that a computer is given the ability to control electronically all the media of the stage, and is able to sense and understand in an abstract way what is happening in that space. Furthermore, suppose that the computer is given the ability to reason about what is happening and could construct abstract responses through media. What would it be possible for the computer to do? The theatrical space is the computer's body, the electronic media the limbs, cameras and microphones used as sensors are the eyes and ears, a speech generation program the mouth, and the CPUs and internal programming are the brains, used to interact with the physical world. The space that holds the performance becomes an environment generated from behaviours of the computer, responding to and shaped by performers, designers, and technicians. Robb E. Lovell describes how this kind of intelligent environment can expand the expressive potential of traditional theatre in many ways, and considers how this will affect the viewers' and performers' perceptions, setting out some of the pros and cons of the involvement of computer intelligence in performance settings. Computer involvement is not, he argues, about the death of traditional theatre forms, but rather about their growth into new realms of expressiveness. Robb Lovell is a resident artist/technologist at the Institute for Studies in the Arts (ISA) at Arizona State University. He is co-creator of the Intelligent Stage, a theatrical space that registers sensory input through video and audio, and responds through lights, sound, video, animation, and robotics. He is currently creating tools for artists and technicians based on the technology of the Intelligent Stage – tools that allow artists to create interactive mediated works. He is working on a practical PhD in Interactive Theatre Design through the Institute for New Media Performance Research.