why is the thumb this way

[Ingvild Roald]

Val,

I am sure that this has been done with some consideration, but I am 
wondering about the system behind the way the thumb is shown in some 
handshape symbols, see attached.

For the A-handshape and the L-handshape, the thumb seems to be where it 
'ought' to be, while for the hitch-hiker's handshape, the thumb is coming 
from the middel of the hand, where the middle finger is.

Can you give an explanation, please?



Ingvild

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