... The stone is its shape from external forces, its shape is not the result of desire, is from the stillness
the animal is formed from the desire and necessity, is formed from an extension to it outside, is the result of the movement
Plant; acquire their shape from the balanced union of the two previous ways, from stone and animal ...
the book on the higher worlds of Rudolf Steiner.
(For this reason, parallelism between the plant and the spiritual path)