fsn (File System Navigator; pronounced "fusion") is an experimental application to view a file system in 3D, made by SGI for IRIX systems.
Even though it was never developed to a fully functional file manager, it gained some fame after it appeared in the movie Jurassic Park in 1993. In a scene in the film, the character Lex Murphy, played by Ariana Richards, finds a computer displaying the interface. She exclaims "It's a UNIX system! I know this!" and proceeds to restart the access control system, locking the laboratory's doors. After the release of the film, some perceived the visualisation as an example of media misrepresentation of computers, citing the computer game-like display as being an unrealistic Hollywood mockup.