Purushottama Yoga - BG 15.2

Some of its branches extend upwards {as the planes of the demigods and celestial beings}, some of the branches extend downwards {as the planes of the humans, animals, and lower species}, and nourished by three modes of nature, its shoots are the objects of the senses. Some aerial roots also extend downwards, to take root in the land of karma, within the human plane.