Drawing Errors or Medieval Symbolism?

[Dobri]

Are you looking for an explanation for the long arm? 
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Interesting that you mention about animation, Aga.

What if this section of the image depicts the superposition of two consecutive frames, the first frame shows the hand hiding the orb and the second frame shows the outstretched hand showing the orb?

I am wondering if there exist similar medieval peekaboo-like illustrations.