No. People just tend to choose ones that are. Here are some that are mostly bilaterally symmetrical, but with left-right asymmetry. http://endlessforms.com/o/

No. People just tend to choose ones that are. Here are some that are mostly bilaterally symmetrical, but with left-right asymmetry. http://endlessforms.com/o/69562/ http://endlessforms.com/o/69562/ (ghost) http://endlessforms.com/o/60967/ http://endlessforms.com/o/60967/ (mad hatter) http://endlessforms.com/o/39225/ http://endlessforms.com/o/39225/ (Dr. Evil) There are some with no symmetry at all....