A robotic computer that moves its monitor "head" and "neck," but that has no explicit face, is being designed to interact with users in a natural way for applications such as learning, rapport-building, interactive teaching, and posture improvement. In all these applications, the robot will need to move in subtle ways that express its state and promote appropriate movements in the user, but that don't distract or annoy. Toward this goal, we are giving the system the ability to recognize states of the user and also to have subtle expressions.