Kohler one-piece toilet trapway design

Kohler like designing things.
Sometimes they come up with really cool things to look at. Sometimes they get carried away though. Here's an example of letting the artist making something really cool looking, but forgetting that it has to function too. Those are pretty sharp bends, don't ya think?

Yes, and some of their toilets have a "barrier" inside them with a triangular opening in it. One of the hazards of letting an engineer design something without ever having to fix his screwups. The key words are "cool to look at", his abacus says it should work perfectly.