raytracing, here's a link to an engraving describing this very, very early 

on the Art of Measurement).
http://www.columbia.edu/cu/lweb/eresources/exhibitions/treasures/html/55.html
This page doesn't explain much in English, but I have a translation in a 
book (that I don't have here right now). IIRC, the string is attached from 
the painted object to the wall, and the intersections between the string and 
the screen are recorded on paper, forming a shape that the artist uses as 
basis for the final painting or drawing. I don't remember exactly how the 
"pixel" is recorded, but I think it's by using some sort of cross-hair 
device attached to the frame (what the guy on the right is doing). I'll 
check later.

And yes, it took time ;)

G.

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