The process? Take a xerox copy of a chunk of a Rembrandt painting (at left here), flip it upside down and try to draw it yourself starting with the dark parts first and going to the light parts. At right is my attempt. Spent 90 minutes drawing the first picture I'd drawn in 20 years and it was a blast. The Japanese lady next to me drew a duplicate so amazing the museum staff all came to check it out. One of them said they could hang it in the pupils exhibition and no one would know it wasn't real. I took a picture of it but lost it unfortunately.
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