The document discusses teaching and learning in 3D virtual environments. It describes a virtual environment called the AET Zone that was created at Appalachian State University to facilitate collaborative learning. The AET Zone utilizes social constructivist pedagogy and aims to develop a sense of presence and co-presence among students. Research suggests these factors are important for building online communities and creating authentic learning experiences. The document also introduces a framework called Presence Pedagogy that describes how educators can best interact with and engage learners in virtual environments.