"Trevor Quayle" <Tin### [at] hotmailcom> wrote in message
news:3bb4efe3$1@news.povray.org...
> Actually the background spheres and the fire thingy in the centre are
> stable. Maybe it's hard to tell though.

    Yes, because they leave the frame. You need to be able to keep your eye
on something and see that it "turns over" as you pass under the strip. It
doesn't need stable things, it needs a stable frame of reference.

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