Participation in learning communities, and the construction of knowledge in communities of practice, are important considerations in the use of 3D immersive worlds. This article describes the creation of this type of learning environment in AETZone, an immersive virtual environment in use within graduate programs at Appalachian State University since 2000. Both student and faculty perceptions of elements such as presence, co-presence, and the forging of active community are presented, along with examples of formal and informal activities which serve as the base for teaching and learning in the Zone.