Having watched Pale Cocoon at the last OAV night, I wondered about who was responsible for its creation. Apparently, like Makoto Shinkai, it's the work of a lone director, Yoshiura Yasuhiro, with interests in making one-off short films/oavs. His other efforts include:
Noisy Birth (2000)
Kikumana (2001)
Both of which look very much like animated music videos
and:
Mizu no Kotoba (Aquatic Language) (2002)
I find anidb's bio on Yoshiura amusing, too. Something to be said for its minimalism.
His studio is Studio Rikka