The Hermetic Tradition envisions a hierarchical organization of the cosmos. The presence of man portends a split in the continuum: for man, there is an outer world of sense experience and an inner world of thought. However, in consciousness, there is no difference. Thought, in Hermetism, is understood as another sense, along with sight, hearing, taste, smell, and touch. We recognize objects in the world by experience of the juxtaposition of colour, shape, texture, sound, smell and so on, that signify the object. Similarly, we recognize beings on the inner plane by the repetition of certain thought patterns. As Tomberg describes how this realization came to Plato:
Plato, the father of metaphysical philosophy, had the experience of trans-cerebral thought, of thought not conceived but seen. That is why he could teach the method of the gradual elevation above cerebral intellectuality, the elevation from possible opinion (doxa), to a probable conclusion (dianoia) due to dialectical argument, and finally to the certitude of immediate perception (episteme).
Plato seems to have made the error of giving reality to the ideas as independent beings. Tomberg goes on:
The entire world is populated only by individual beings, and Ideas live and exist only in them, by them, and in the relationships they establish between them. The ideas are certainly real, but as immanent reality, not as a reality on their own. Ideas live only in consciousness, whether that of God, of the angelic hierarchies, or of man.
Yet, just as a colour or sound exists only in consciousness, they reveal an objective reality. Similarly, for thoughts (or ideas), which also are experiences of an objective reality. Tomberg explains:
But they can also be projected outside, incarnated in symbols and formulas, thus conserved in the objective spiritual world.
So the man with clairvoyance or spiritual vision will experience a thought but “see” a gnome or an archangel, that is, the object the thought corresponds to, expressed in the language of a symbol or myth.