Physical items -- brochures, photographs, small coins, glow-in-the-dark plastic stones, and other paraphernalia -- distributed along with IF software, either purely for aesthetic/immersive value, or to serve as a copy-protection mechanism (offering clues to an in-game puzzle). These were often found in Infocom games.
Some amateur IF has also included feelies, either as accompanying files (webpages offering background for the game, for instance), or in a physical form which the player could order from the author.
The term "feelie" was employed by Aldous Huxley in Brave New World (1932), where it was applied to a kind of movie that offered tactile feedback.
- The Feelies - article by Jason Scott. Read about the Feelie that started it all, Dennis Wheatley's Murder Off Miami which was first published in 1936 and re-issued in 1979.
- Feelies, Maps, Cover Art - article by Emily Short.
- Feelies at TV Tropes Wiki.
- Feelies - Italian article at L’avventura è l’avventura.
- Feelies.org (archive). Your (former) one-stop shop for interactive fiction feelies. Feelies.org as an IF organization disappeared in early 2008; the website is currently (2016) used by "The Feel Good Mob".