From the beginning of part 2, chapter 2:
Winston picked his way up the lane through dappled light and shade, stepping out into pools of gold wherever the boughs parted. Under the trees to the left of him the ground was misty with bluebells. The air seemed to kiss one’s skin. It was the second of May. From somewhere deeper in the heart of the wood came the droning of ring-doves.
What is the meaning of "pools of good"?