ggg (or “three g”) books are produced by Dai Nippon Printing in Tokyo, Japan.
You can search by exhibition over here to take a peek at what’s been shown there until now. In 1996 I had the fortune of having a show there entitled “Paper and Computer,” and another one in 1999 entitled “One Line.” This was what “Paper and Computer” looked like:
For the “One Line” show, I believe in 1999 this is likely the world’s largest co-constructed continuous line:
I wrote a Java Applet that would take single-line drawings off of a specially-designed interactive portal on the Internet, and my system would stitch them all together.