Elemental spirits and "astral shells" that inhabit the various sub-planes.
: The astral world is the third of seven planes of being, situated above the material and force planes.
The air was filled with a vibrant, pulsating energy that seemed to reverberate through every cell of my being. The sky was a deep shade of purple, and the trees were a radiant silver, their leaves shimmering like diamonds. I saw beings moving about, their forms shifting and morphing like mist.
The Astral World: Its Scenes, Dwellers, and Phenomena Swami Panchadasi (a pseudonym for the prolific New Thought author William Walker Atkinson