I've seen another picture, I think from China, of a tandem, although they were both faced the same way. So it's been done.
Here we go, scroll down on this page:
http://www.unicycling.org/btdt/unique.html
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"be careful this rando stuff is addictive and dan's the 'pusher'."
Last edited by StephenH; 09-15-10 at 12:00 PM.