The fictional worlds created in science fiction and fantasy sometimes contain characters that speak languages invented for these fictional worlds. These fictional languages are a category of constructed languages that is known as artistic languages. Some well-known examples:

• Quenya, an elven language from J.R.R. Tolkien's Middle-earth,
• Klingon, from the Star Trek universe (someone even tried to speak to his son in Klingon for three years),
• Dothraki, from J.R.R. Martin's A Song of Ice and Fire and its television adaptation Game of Thrones.

It is easy to speculate that most people who learn such languages are fans of the fictional worlds for which they were invented, but are there any surveys or studies on this?

The fictional worlds created in science fiction and fantasy sometimes contain characters that speak languages invented for these fictional worlds. These fictional languages are a category of constructed languages that is known as artistic languages. Some well-known examples:

• Quenya, an elven language from J.R.R. Tolkien's Middle-earth,
• Klingon, from the Star Trek universe (someone even tried to speak to his son in Klingon for three years),
• Dothraki, from J.R.R. Martin's A Song of Ice and Fire and its television adaptation Game of Thrones,
• Na'vi, from James Cameron's film Avatar (see LearnNavi.org).

It is easy to speculate that most people who learn such languages are fans of the fictional worlds for which they were invented—though some people learn them for linguistic reaons—, but are there any surveys or studies on this?