Stumbled on this studio the other day rather interesting.
This is what wiki says about them;
Studio 4°C is a Japanese animation studio founded by Koji Morimoto, Eiko Tanaka, and Yoshiharu Sato in 1986. The name comes from the temperature at which water is densest. They are known for marrying the spirit of independent festival animation with a more mainstream anime aesthetic. In addition much of their output is considered superflat with some artwork from Morimoto being featured at Takashi Murakami's exhibitions.
If you want to check out their official site Click here.
They do some ethereal and beautiful stuff, posted some of their work here for you to have a look at.