In MUD there is no physical interaction, so this chosen identity become the only identity. The main point is MUD provides a sense of adventure, a sense of community and while all the time keeping the inter-actors masked through false identities. Looking at Geocaching through the same macro lens, we see that it has all the components of MUD communities, searching for the cache is adventurous, posting messages at the cache, using technology, all the while under your Geocaching identity. MUD people and Geocachers could also seem black and white. Although the similarities outweigh the differences.
Isolated individuals can find solace in interactive computer-mediated communication.
Relate this to the man living alone miles from a community. He enjoys nature and peaceful isolation, yet he seeks people to identify himself with. Geocaching affords him the opportunity to remain in nature and interact while keeping his anonymity intact. MUD are an interior window to exterior worlds while Geocaching is an exterior window into interior worlds. The Geocacher finds trinkets and writings of fellow Cachers, he becomes an archeologist, piecing together the identities of these anonymous prize seekers.