This film is a visual masterpiece. Everything is geometrical. At first glance the animation looks juvenile and simple, but the scenes are so well laid out and intricate. The characters are very geometrical in nature, and when they run in a group they form a single shape. The cracks or shapes in between objects or objects themselves are all patterned.
One flaw I found in the film was that the monks were all of different nationalities and the portrayal of their different nationalities was really racist, almost offensively so. They weren't a large part of the film though, so it didn't bother me as much as they would have if they'd played a larger role.
http://www.newvideo.com/secretofkells/