Just my two cents:
I believe that the astral body (or whatever) is more aakaashic (akashic) than
the anna-maya-kosha ("food-body").
When one realizes the connection or relationship (saMbandha) between the
carnal body (kaaya) and "nothingness" (aakaasha), the superconductivity of the
astral body (or whatever) "leaks" over to the anna-maya-kosha strongly enough
for the body to leave the ground (bhuumi-tyaaga of Yoga-tattva-upanishad or
somesuch) with a little help from the muscles, eventually floating over Earth's
magnetic field. Or something like that??
