땅거미, ttanggeomi: the dusk just after the sun has gone, when it is not dark yet but the edges of things have begun to go.
The hills flatten into cut paper. The lane fills up with blue-grey. Somewhere a window comes on, and for about twenty minutes that one light looks warmer than it will all night.
Cities have largely done away with it. We go from lit room to lit street to lit room, and the day changes over somewhere in between without our seeing it happen.
This evening I left the lamp off rather longer than I needed to.