Draw the Line!

At today's Estate Sale in the community of Del Cerro in San Diego, CA, we came across an ancient Japanese chalk line tool called a Sumitsubo. 

"In East Asia, an ink line is used in preference to a chalk line. This is a silken cord, stored on a combined reel and inkpot called a sumitsubo (ja) in Japanese. Alongside the line reel is a cavity filled with ink-soaked cotton fibers, which the line is drawn through as it is unreeled. These sumitsubos are highly decorated and much-prized by their owners. As with many such tools, they're often made by their users while apprentices."

https://en.wikipedia.org/wiki/Chalk_line#Ink_lines