Leaves of Morya's Garden - Book 2 - Illumination (1925) - 2.9.2: 2.9.2. I consider that the miracle of nature-spirits can be explained. Their main property is elasticity. Their form depends upon the aspiratory conditions. Falling into the focus of human sight, they are sucked into human form. Men will see them in human shape and animals will see them as animals, because they have no shell.