What do the Planetary Spirits look like?

[narfellus]

Bardon gives excellent lessons to conjure and question the 72 spirits of the zodiac. In Evocation, he refrains from many details regarding certain spheres, stating that the beings within are unruly and not favorable toward humans. I even read speculation that the names he DOES provide are in code, as to thwart unready initiates from summoning beings that would harm them. Whether positive or negative aligned, or simply neutral in the grand scheme of the universe, what do these beings LOOK like, in terms of either astralsight or normal vision? I suppose this is a rather weighty question directed at those practitioners who've actually summoned these things to work with them.