Source for Gerrit Noordzij drawing?


I've seen this image online several places (for example, here). 
Does anyone know the original source?

I thought it must be "The Stroke"—but I don't see it in my (older) copy. 
I have also looked at this older version ("The Stroke of the Pen") but I don't see it there either!
I also have "Letter Letter"—but I don't see it in there either?

I was hoping to credit the image properly in a slide lecture...


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