Tim Rightnour wrote:

> On 01-Feb-00 Chris G. Demetriou wrote:
> >> actually, i think the big thing is that they be "rotationally"
> >> symmetric, not "reflectively" symmetric.  like a fan blade...not like
> >> a bird.
> 
> I would imagine getting a rectangle to be rotationally symmetric would be
> pretty trivial.. think 2-blade propeller.

I'm thinking 2-blade propeller inside my CD-ROM drive and not getting
very excited at all :-)

Simon.