For me, If one is going in opposite directions with both hands, then the movements are obvious.  If we were to make a rule that added that extra thumb, that would instantly add another 96 rotations to each hand, so it is not, I would think, worth while to do.
 
The opposite 8 rotations are seen, to me, as mirror reflections because we are biliaterally symmetric. You cannot easily turn your own hand around 180 degrees so the extra writing would be so little used as to be a lot of programming for nothing.
 
We already have 96 per, making it 192 would make it prohibitive to include.
 
Charles

 


From: Gagnon et Thibeault <[log in to unmask]>
To: [log in to unmask]
Sent: Tue, December 7, 2010 1:41:02 PM
Subject: Re: Photo 3E and photo 3F ?

Hi Charles,
 
    Thank you very much for your answer.  But, it is not easy to read quickly same symbols (D and E) and (C and F).
 
    Regards,
 
    André
----- Original Message -----
From: [log in to unmask] href="mailto:[log in to unmask]" rel=nofollow target=_blank ymailto="mailto:[log in to unmask]">Charles Butler
To: [log in to unmask] href="mailto:[log in to unmask]" rel=nofollow target=_blank ymailto="mailto:[log in to unmask]">[log in to unmask]
Sent: Tuesday, December 07, 2010 12:58 PM
Subject: Re: Photo 3E and photo 3F ?

Gagnon,

I would say that D becomes E, and C becomes F.  That has always been the case if you reverse the hands then the mirror image applies to the opposite rotation.  Else we would have to have a thumb on the white side of the palm, which is never been the case.  The thumb follows the back of the hand side.

Charles



From: Gagnon et Thibeault <[log in to unmask]>
To: [log in to unmask]
Sent: Tue, December 7, 2010 10:10:32 AM
Subject: Photo 3E and photo 3F ?

Hi Val and everyone,
 
    See the attached right and left hands.  You look at 2C, 2D, 3E and 3F.
 
    I describe a photo 2C.  A palm of the left flat hand with a side thumb is facing to the left side wall.  The side thumb is facing to the signer.
 
    For a photo 2D, a palm of the right flat hand with a side thumb is facing to the right side wall.  The side thumbe is facing to the signer.
 
    Now, I ask you how do you write down for photos 3E and 3F?
 
    I explain a photo 3E. A palm of the left flat hand with a side thumb is facing to the right side wall.  The side thumb is facing to a front of the wall.
 
    For a photo 3F, a palm of the right flat hand with a side thumb is facing to the left side wall.  The side thumb is facing to a front of the wall.
 
    Best regards,
 
    André