> Any ideas of it's authentic? It is. And it's nothing new and well-known[1]. OP is Fermats library's high resolution picture of the 17th century reproduction.

> Any ideas of it's authentic? It is. And it's nothing new and well-known[1]. OP is Fermats library's high resolution picture of the 17th century reproduction. [1] https://en.wikipedia.org/wiki/Zhoubi_Suanjing https://en.wikipedia.org/wiki/Zhoubi_Suanjing