Holy Zohar text. Daily Zohar -91.

Tikkun #5 – continue

“He covers himself with light as if it were a garmentPsalms 104:2
The secret of the word “covers” is that the light when concealed without spreading out, it is called air אויר. It is concealed by the letter י.

When Malchut, which is the middle point, a little dot, elevated to where Israel Saba and Tevunah that are Binah and called palace it sweetened the judgment of Malchut and the Light of Binah became air רוח, which is also the aspect of Ruach.
The י joined the Light אור and created אויר. (= air)
When the Yod י took out from אויר, the light was revealed and that is “…Let there be Light…”