The Unattainable Limit

I’m rather partial to this one, and haven’t used green very often. I think I need to revisit this as a colour as it soothes me when I look at it. What do you think is the significance of the darker line? It seems to creep into a lot of this style of painting – I know, but then that would be telling wouldn’t it?

The Unattainable Limit – LHS III