Board Thread:Speculation House/@comment-26025032-20160119021526/@comment-25396609-20160119173244

Aura is most probably generated by a sufficiently complec neural net (that means brain and nervous system for those non science types)

As Penny is fully sentient it is a simple matter of her main core being intricate enough to replicate the neural pathways of the human brain, thus allowing generation of a natural aura.

Penny may be synthetic, and the generation may be an artificial fascimile, but her aura itself is very real, and so is her soul.