posted on Nov, 8 2008 @ 08:33 PM
There might be friction where they come from originally, or as you say, there might not!
1) If Lazar and company are right, wouldn't a circular shape play along with the idea of anti-gravity? By moving around by placing a gravitational
field in the direction you are moving wouldn't a sphere or a circle be perfect? ALso bear in mind that circular objects have central points of
gravity.
2) Spin, we're talking alien (in more sense than one). Again I'm speculating, perhaps they need to rotate quickly. Perhaps not.
Of course, I prefer to think of aliens as using the 60's cigar craft. Now THAT'S style.