There's a line between light and dark

Carrie Newcomer (born May 25, 1958) is an American singer and songwriter. In the album "Geography of light" (2008), she explores the impalpable experiences we have in our lives. Like the nature of light, these experiences can't be perceived by the sense of touch.

A lot of the "Geography of Light" is about trying to put into language and music all those things we experience and recognize, that have no language. I mean, how many words do we have to try to describe the quality of light? Glow, beam, shimmer, radiate…. It’s about navigating that shadow and light in our lives, and all those gray spaces in between. There aren’t any easy answers – but there’s a lot of good questions. (From a Carrie Newcomer's interview about her album).

The song "A Map of Shadows" originated as an essay describing an experience of watching the night become morning:
Well well well - it's so hard to tell .
There's a line between light and dark,
Between heaven and hell.
Well well well - it's not easy to see.
What's out there on my left or right,
Or what's right in front of me.