'Hallucinaut' was to be "a micro fantasy" film short film produced by Terry Gilliam and directed by Daniel Auber (who has worked as a digital concept artist on several of Gilliam's films). According to the film's IMDb page, it's still in post-production.
Here's an old story from 2014 about the short:
https://web.archive.org/web/201409070840...cinaut.php
The good news is that the official website is still up: http://hallucinautfilm.com/
'Hallucinaut' IMDb page: https://www.imdb.com/title/tt3914020/
Update: It seems Daniel did an IAmA on Reddit a few years back: https://www.reddit.com/r/IAmA/comments/2...r_special/
Here's an old story from 2014 about the short:
https://web.archive.org/web/201409070840...cinaut.php
The good news is that the official website is still up: http://hallucinautfilm.com/
'Hallucinaut' IMDb page: https://www.imdb.com/title/tt3914020/
Update: It seems Daniel did an IAmA on Reddit a few years back: https://www.reddit.com/r/IAmA/comments/2...r_special/