For most people, the ether (aether, æther, aither) is an imaginary substance and for physicists, a hypothetical invisible substance pervading space, but for Brahma, the Creator and Sustainer of the Universe, the ether is neither imaginary or hypothetical.
Brahma, as you know, if you have read or are reading the various posts and pages on this site, separated into male and female (Vishnu, God of Heaven, and Lakshmi, Goddess of Earth) and such creates the everything.
The Sanskrit word Soma, commonly translated as the Nectar of Immortality, is more accurately translated into English as nectar, heaven, air, ether, and so on, and the Sanskrit syllable Kha can be translated as the sun, or the air, sky, ether, and such.
Here is a verse from Rishi Gotama Rahugana, the Grandfather of Buddha Shakyamuni, the last Enlightened Being to walk the planet. The verse is from the Rigveda, and Gotama is in a conversation with Brahma.