Fictional language is a device used by authors to underline differences in culture by having their characters communicate in a fashion which is both alien and dislocated. Primary examples of this are the many languages of
JRR Tolkien's Middle Earth,
George Orwell's
Newspeak in
1984, Ursula K. LeGuin's Pravic
? in
The Dispossessed, [Anthony Burgess]
?'s Nadsat
? in
A Clockwork Orange, and
Star Trek's Klingon
?.