Md. My dear Sir, The questions you put refer rather to physical than to psychical matters. It is, of course, possible that mirages may be produced by nature-spirits, but the question is wholly speculative and of little practical moment. Ordinary scientific explanations seem adequate to account for them, and, when this is the case, I doubt the wisdom of seeking others more remote. I am so burdened with work and duties, personal, editorial, and official, that I have to ask your indulgence for a reply so brief. The only available books on those sunsets are eastern ones in Sanscrit untranslated yet into English.
Mirages have nothing to do with spiritual development.
They occur also in cities in the East. Elementals are concerned in all the operations of nature. Nearly 4000 have now been used. The plates have been electrotyped for permanent use. Don't do anything about this.