Light slowly tumbling downhill.
I see light on the landscape the same way I see water falling.
Many, when they think of sunlight, see a light, warm color. But as you can see here, sometimes light takes the form of a cool-ish neutral. Imagine a shallow stream flowing over the hill, maneuvering around clumpy grass and small rocks....
I was thinking, "Fall away. Trickle." and "Purple."
As well as "soft" and "quiet".