In the astral world everything exists, as it were, in the form of a picture reflected in a mirror, and a pupil of spiritual science must therefore get accustomed little by little to see things in the RIGHT way. For instance, you may see the number 365, but this really corresponds to 563. This applies to everything which we see in the astral world. There, everything that goes out of our own being appears as if it were coming towards us. It is most important to consider this fact.
When astral images arise, for instance, in pathological conditions, we must know how to deal with them. They often appear when people are delirious; a delirious person often sees all kinds of faces and forms rushing towards him, for the astral world becomes accessible to him in this pathological condition. Although these astral pictures seem to be rushing towards him, they are in reality streaming out of him. […]
The subject of a painting such, as for instance, the well known “Temptation of Saint Anthony” is based on such astral experiences.
Source: Rudolf Steiner – GA 100 – Theosophy and Rosicrucianism: Lecture IV: Man’s Further Destinies in the Spiritual Worlds – Kassel, 19th June, 1907