Seal No. 3 : The four riders The four riders (the harmony of the spheres) represent the mysteries of the so-called harmony of the spheres. You experience these mysteries, Steiner says, in the interval between death and a new birth. The angel blowing the horns represents the spiritual primordial essences of world-phenomena.The apocalyptic riders represent the main points of development, through which a human individuality passes in the course of many incarnations and which are represented on the astral plane in the four riders on horses: a shining white horse expressing a very early stage of soul development; a flamecoloured horse indicating the warrior stage of the soul's development; a black (or blue) horse corresponding to the stage when only the soul's outer physical perception is developed, and a gleaming green horse, the picture of the ripe soul, which has gained mastery over the body.