This article may be of interest to some of your students.
Building Middle-Earth: 'The Lord of the Rings' Online
By ETHAN GILSDORF - January 24, 2007
(copied from article) In 1955, shortly after "The Lord of the Rings"
was published, J. R. R. Tolkien began to worry his creation had become
a "vast game" for some readers. This was not good, he wrote, even "for
me, who find that kind of thing only too fatally attractive."
Now, Tolkien's "Lord of the Rings" and the imaginary setting he
painstakingly built, Middle-earth, has become that "vast game."