Ga-nime (画ニメ, Ga-nime), a portmanteau of “illustration” (画, ga) and “anime”, is a relatively recent trend in Japanese animation to create highly aesthetic short anime films using non-traditional animation techniques, often directed by artists who have limited involvement with the anime industry.
Typically, these films will utilize a series of illustrations accompanied by voice acting and music, with the only motion provided by extremely simplified limited animation, computer animation, camera movements such as panning and zooming, or stop-motion animation. They are generally produced by only a handful of staff members, with the director often writing, illustrating, or even scoring the piece themselves.
Since 2006, Toei Animation has produced several ga-nime, directed by various notable artists, including Yoshitaka Amano and Keita Amemiya, on a variety of subjects ranging from original stories to adaptations of the works of Osamu Dazai, Sakutarō Hagiwara, and H. P. Lovecraft. (Wiki)
Ga-nime (Official Website)
Some works:
G-9 by Keita Amemiya
Bird’s Song by Yoshitaka Amano
Fantascope ~Tylostoma~ by Yoshitaka Amano
This reminded me of the animation segment from Robot Carnival called Cloud directed by Mao Lamdo with music by Isaku Fujita.
Kitsune's Thoughts 
The animation is nice, but the music sounds like they’re putting me on hold at the customer service hotline.
haha That must be some relaxing music then 😛
And I thought it will be called MANGANIME.
Nah, manganime is this and this if you want to see more.
I started watching the Ga-nime shorts last year. There are still some I’m looking for, but the ones I’ve found online have been really interesting in terms of the diverse visual styles and more stripped back approach to audio. I was pleasantly surprised that many of them were horror anime or had horror undercurrents, since we don’t get too many of those nowadays.