Life In 19x19

There is video on the Veritasium YouTube channel about QR codes. The host illustrates with a "25" by "25" go board.
https://www.youtube.com/watch?v=w5ebcowAJD8

The man who created QR codes had the idea when looking at black and white stones on a go board.

It is difficult to watch someone place the stones so far away from the intersections and with their thumbs.