Dave, nature is only superficially symmetric. Some aren't even that, that girl in my senior year was 34A/C. weird. I don't recommend trying this at home, but if you cut open someone's abdomen, you'll find that we are very assymetric. And functionally so.
Don't want to flog a dead horse, but you live on the west coast and still think that fish are symmetrical? Go Halibut fishing.
Of course, airplanes aren't symmetrical, at least those with one engine and a prop aren't. Racing canoes with an outrigger are assymetrical. My bicycle has a chain only on the right side, my tricycle a bell only on the left. The Porsche 959S, which by all accounts is a fine example of an automobile, has a rearview mirror only on the driver's side.
. .Even the most simple of the building blocks of matter (subatomic particles) are assymetrical. Likely the most basic is the neutrino which by all proven accounts has only spin as an attribute. Chirally assymetric, just like a conventional helicopter.
(edited to add a happy face, <img src="smile.gif" border="0"> )
[ 26 January 2002: Message edited by: heedm ]</p>