Question: Which animated short film created by Patrick McHale was Over the Garden Wall based on 

Context articles: List of Over the Garden Wall characters
Patrick McHale (artist)
Over the Garden Wall (disambiguation)
Tome of the Unknown
Over the Garden Wall
Wild Life (film)
The Unknown (Over the Garden Wall)
The Lady and the Reaper
Garden Wall
9 (2005 film)

The American animated television miniseries "Over the Garden Wall" features a cast of fictional characters created by Patrick McHale.
 The series revolves around two half-brothers, Wirt (voiced by Elijah Wood), the older brother, an awkward and poetic young adult; and Gregory (voiced by Collin Dean), the younger brother, an energetic optimist.
 The duo travel through a strange forest, searching for the way back to their home, and encountering wondrous things along their journey.
 On their quest, Wirt and Greg interact with characters such as a bluebird named Beatrice (voiced by Melanie Lynskey), the Woodsman (voiced by Christopher Lloyd), and the Beast (voiced by Samuel Ramey).
Patrick "Pat" McHale (born November 17, 1983 in New Jersey) is an American writer, storyboard artist, animator, songwriter, and independent filmmaker.
 He is best known for being a writer and creative director on the animated series "Adventure Time" for Cartoon Network, which he contributed to during its first five seasons, and creating his own Emmy award-winning mini-series "Over the Garden Wall".
Over the Garden Wall is an American television series created by Patrick McHale for Cartoon Network.
Tome of the Unknown, the full title of which is Tome of the Unknown: Harvest Melody, is a 2013 animated short film created by Patrick McHale.
 In the film, Wirt (Elijah Wood), his brother Gregory (Collin Dean), and Beatrice, a bluebird, head to the big city in search of an arcane book of all known things, meeting a vegetable man along the way.
Over the Garden Wall is an American animated television miniseries created by Patrick McHale for Cartoon Network.
 The series centers on two half-brothers who travel across a strange forest in order to find their way home, encountering odd and wonderful things on their journey.
 The show is based on McHale's animated short film "Tome of the Unknown", which was produced as part of Cartoon Network Studios' shorts development program.
 The show features Elijah Wood and Collin Dean as the protagonists Wirt and Greg, and Melanie Lynskey as a bluebird named Beatrice.
 "Over the Garden Wall" was broadcast throughout the week of November 3, 2014 to November 7, 2014.
Wild Life is a 2011 Canadian animated short film by Wendy Tilby and Amanda Forbis.
 The film debuted at the 2011 Worldwide Short Film Festival in Toronto in June 2011 and online on January 6, 2012.
 The film was nominated for Best Animated Short Film at the 84th Academy Awards, and Best Animated Short Subject at the 39th Annie Awards as well as a Genie Award for Best Animated Short at the 32nd Genie Awards.
"The Unknown" is the final episode of the American animated television miniseries "Over the Garden Wall".
 It first aired on Cartoon Network on November 7, 2014.
 The episode's story was supervised by Amalia Levari, Tom Herpich, and series creator Patrick McHale, while writing and storyboarding were managed by Herpich, Jim Campbell, and Natasha Allegri.
The Lady and the Reaper (Spanish: "La dama y la Muerte" ) is a 2009 Spanish 3D imaging animated short film created by Javier Recio Gracía and produced by Kandor Graphics and Green Moon.
 It was nominated for an Academy Award for Best Animated Short Film and won the Goya Award for Best Animated Short of 2009.
 It was also included in the Animation Show of Shows.
The Garden Wall is a steep alpine area within Glacier National Park well known during the summer months to be heavily covered in dozens of species of flowering plants and shrubs.
 Located along the west side of the Continental divide and extending northward from Logan Pass, the Garden Wall can be traversed via the popular Highline Trail and for a distance of over 5 mi to the Granite Park Chalet.
 The Going-to-the-Sun Road also passes through portions of the Garden Wall northwest of Logan Pass.
 The Weeping Wall is a short stretch of the Going-to-the-Sun Road where water cascades over the Garden Wall to the roadway below.
 The Garden Wall is an arête or rock spine that separates the Many Glacier region of the park from Lake McDonald valley.
9 is a 2005 computer animated short film created by Shane Acker as a student project at the UCLA Animation Workshop.
 Tim Burton saw the film and was so impressed by its artistic vision that he went on to produce a feature-length adaptation also titled "9", directed by Acker and distributed by Focus Features.
 The film was presented at the Indianapolis International Film Festival.
 It was nominated for an Academy Award for best animated short film, but lost to "", although it did win a Student Academy Award for Best Animation.