Perfectly comprehensible is the desire to know why in visiting the Subtle World we are not struck by the polychrome of the auras. In the first place, the consciousness transposes many impressions, but the main thing is that there exists a synthesized harmony. It is indeed possible to distinguish the degree of illumination, and the radiation itself, just as in the carnate world, can be evoked mentally. It would be unbearable if the whole Subtle World were atremble with many-colored rainbows. Even on Earth the rainbow can sometimes be irritating. But the Subtle World is actually aglow in perfect harmony. We are not speaking about the lower strata, where it is impossible to find harmony. (FW I (opens in new tab), 163)
So, too, one should not think that in the Fiery World its beings are constantly surrounded by tongues of flame. Fire can be crystallized, but its habitual state may be characterized as light. These communications are simple, but it is better to mention them in order to avoid the usual misunderstandings. (FW I (opens in new tab), 164)