Yes, it looks like the Saddle shape is what I'm looking for.  Thanks!  :)

However, had you not pointed it out to me, I would have embarked upon
construction of a new povray primitive (called twisted_square).  So I stand
by my decision to post to this group!

Many thanks,
Edmund.

"Warp" <war### [at] tagpovrayorg> wrote in message
news:39ed8843@news.povray.org...
>   I answered your question in my previous post. Wasn't it enough?
>
> --
> main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
> ):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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