After seeing THE CATHEDRAL (KATEDRA), I looked on IMDb for reviews of this Oscar-nominated short and the first one dramatically proclaimed it was "robbed at the Oscars"--implying the winner should not have won. So, that encouraged me to see out the winner (with the bizarre and less than exciting title "THE CHUBBCHUBBS") and I'm convinced that the AMPAS people (the organization giving out the Oscars) did NOT screw up by not giving the award to THE CATHEDRAL. While THE CATHEDRAL was amazing to watch from a visual perspective, it really looked much more like a cut scene from a video game than an actual short film. Whereas the CHUBBCHUBBS was very funny and a complete narrative--with excellent animation, writing, voice acting, etc. Plus, when I dug further, I watched ALL the nominees and found that DAS RAD (another nominee that failed to win) was also much better than THE CATHEDRAL. In fact, for originality, DAS RAD definitely was supreme in this category.
Still, my advice is see them all--and perhaps the other Oscar nominees from the 2003 Oscars. They're lovely little short films--though ATAMA-YAMA might make your brain hurt since it's so very weird.