[Keiichi_JPU]

I might understand the possible meaning of "Ten" and "Sen".
I was listening to her DEEP RIVER album yesterday, and the title song actually tells about Ten and Sen! It caught me off-guard, lol.

This is the fist verse and my -probably crappy- translation:

Ten to ten wo tsunagu you ni
Sen wo egaku yubi ga nazoru no wa
Watashi no kita michi soretomo ikisaki

As it connect the points together,
the finger, by drawing a line, traces
the road I came from, or my destination.

Ten (dot) = The book with a self-written essay about her marriage, divorce and writing music. In short: it's about her personal life.
Sen (line) = The book with all her blog-posts collected together, as well as photographs.

So maybe she means that "Ten", the story about her life, consists of certain points. These probably include: debut, marriage, divorce.
And "Sen" might be the line that connects it all with her constant stream of blog posts and pictures.