What are some special about pine tree in paragraph one

Pine trees are not directly mentioned. We learn that the trees have created shadows..... and that the sunset was glistening through the trunks of the trees.

The woods were already filled with shadows one June evening, just before eight o'clock, though a bright sunset still glimmered faintly among the trunks of the trees. A little girl was driving home her cow, a plodding, dilatory, provoking creature in her behavior, but a valued companion for all that. They were going away from whatever light there was, and striking deep into the woods, but their feet were familiar with the path, and it was no matter whether their eyes could see it or not.