Another great example of using a virtual world for education: 3D AIDS Quilt
Squares on the quilt are rooms where you can explore the lives of individuals who lived with AIDS. The immersive display opens on Dec. 1 on Storybook Island in Second Life©, and you can find the location here: http://secondlife.com/destination/3d-aids-quilt
Such an exhibit is an example of how a concept can take on both physical and symbolic form in a virtual world.