>> actually, i think the big thing is that they be "rotationally"
>> symmetric, not "reflectively" symmetric.  like a fan blade...not like
>> a bird.
>
>Yeah, OK.  I don't know what that means in terms of something i can
>actually look at, and figure, assuming a uniform material density,
>though.  8-)

it just means that you should be able to cut out an arbitrary chunk,
rotate it 180 degrees (or 120 or 90 or 60, depending on how ambitious
you are) and cut the exact same chunk, repeating until you've gone
three 360 degrees, and end up with something that spins nicely.

>However, looking at the business card CDs that i've got here, they
>really do seem "right."  (they're just the simple disks with two
>chunks cut off.)  I don't remember all of the definitions, but i think
>the are in fact symmetric over the center point (despite my previous
>comment to the contrary)...

datapoint: redhat (bleah! :) makes recovery disks in this form.

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