Pretty natural heathers and snow, snow, snow

Not long ago we introduced natural, undyed heathers in Chickadee: Audouin, the lighter, and Caspian, the darker. And, after what seems forever, we now have these colors in our other core yarns: Finch, Lark, Osprey, and Puffin, as well as little Chick.

Today, surrounded by expanses of snow, I'm favoring the lighter shade.

What do I mean by 'expanses of snow?' I mean this: