I just watched Fantastic Planet for the first time last night, and my mind is officially blown. For those who haven't seen it, it's a stunning full-length animated sci-fi story about a race of quasi-fascist giant blue creatures and the tiny "human" beings - called Oms - they keep as pets. Eventually the Oms rebel, and an inevitable war ensues. But really, the plot is beside the point. The real magic here is the artwork and design that's gone into each and every moment of this film.
Now it must be said that while I like some sci-fi, as you know my own tastes skew a bit more fantastical, and yet this film is one of the most visually surprising I've seen, with all sorts of marvelous images and strange ideas. And the animation itself beyond impressive, with full shadow rendering and cross-hatching and gradient colors (unlike the smooth color blocks used in most cartoons). The filmmaker Rene Laloux stated in an interview (also featured on the DVD) that there will probably never be a film made like this again, as it was so expensive to spend so much time on each cell the way they did. But their efforts were, to my mind, so incredibly worth it, as they created a masterpiece of texture and imagination that is unlike pretty much any other film, animated or otherwise, that's out there. Truly amazing.