Thank you Bob for your answer.
You are right that the thumb in the original seems a bit awkward.
The example that you posted illustrates the point that the figure
in the manual tries to express.
Of course, the hand is schematic, robotic...
I'll play around with this to see what I can get (blobs?),
and hopefully someone might know how the original was produced.

In my experience, the best tutorials are gained starting with a
good example and understanding how they were programmed.
It would be nice to have source code for all of the illustrations
used in the manuals...

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