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rotating rings illusion

• To: mathgroup at smc.vnet.net
• Subject: [mg80787] rotating rings illusion
• From: "Imran Akbar" <imran at sulug.stanford.edu>
• Date: Sat, 1 Sep 2007 00:36:53 -0400 (EDT)

Hi,
   i'm just starting to use mathematica...

i'm trying to mathematically model the two rotating rings illusion as shown
in this video:
http://video.google.com/videoplay?docid=-3761503348838584940&hl=en

1)  how do you create a ring in mathematica?  i found the circle command,
but that's only 2d.
2)  how can I orient each ring so that they're perpendicular to each other?
3)  how do I vary the # of rotations per minute in an animation?

much obliged,
imran