Virtual worlds like Second Life allow users to interact through avatars in a simulated 3D environment. Second Life opened to the public in 2003 and is entirely user-generated. Choosing an appropriate professional avatar appearance is important for educators, as extremes should be avoided. Avatars' movements and abilities like changing appearance can be useful teaching tools, for example to enhance role-playing activities. Second Life provides an ideal platform for students to engage in creating their own learning experiences and environments instead of just passively consuming information.