Our aura is our elliptic subtle body like a sparrow's nest

'Aura' is our 'subtle body' permeating and surrounding our body.
This is elliptic in shape, something like the nest of a special type of 'sparrow'.
In Tamil Language, this sparrow is called 'ThookaNaankuruvi'.
It is this body that contains our different 'spiritual energy centres'.

Beginning to perceive ourselves as our aura pervading our body is 'spiritual transformation'

We may begin to feel our thoughts and our aura outside our body.
This experience may begin to settle down in our lives.
Then, we may begin to feel ourselves, as our aura pervading our body.

This change from our perceiving ourselves as our body
to our perceiving ourselves as our aura pervading our body
is what is called as 'spiritual transformation'.