Yes, that's what I'm talking about. That sphere expands.
Are you referring to the eighth chakra above the top of the head, according to some? It may be of interest in this context that in the Golden Dawn's Middle Pillar exercise, the energetic centre that corresponds with Kether is in fact visualized as a sphere above the head rather than at its top.
Furthermore, Kether - in all its intangibility - is in fact seen as first threshold for the Infinite Light (Ain Soph Aur) on its way to physical manifestation, beyond which lay the three planes of 'negative existence.'
This conception has an interesting (although more limited) analogy in the virtual particles' constant popping into and out of existence, from and back into an all encompassing, energy filled vacuum.
Thank you for this post.