"I am the daughter of Earth and Water,
And the nursling of the Sky;
I pass through the pores of the ocean and shores;
I change, but I cannot die."
Excerpt from the poem "The Cloud", by Percy Bysshe Shelley, used by the segment's story team to describe the Sprite in concept art.
I just love her so much
Here is the Summer Sprite: [link]
And here the Winter one: [link]