It's a telepathic communication.
The proof that the crop images were created by telepathic transmission is literally staring us in the "face".
Only when we viewed in thumbnail format the transmitter section of the Chilbolton schematic did the confused pattern of dots resolve into a cross hatch of lines -exactly similar to the cross-hatching pattern in front of the "face" in the other image.
The inference is obvious. The two crop images are meant to be viewed as a set. The face we see is the transmitter behind the message. Its a telepathic communication.
However, The representation of the "head" in the transmitter - does not have two dots for eyes and, say, three for a mouth. That would have been easy to do. Instead, the "head" has a tiny circle inside --like a lens of some sort. Indeed the device it looks like a TV camera.
How do we square both these clues with each other? Probably the communication is initiated by a telepathic mind --then boosted perhaps with a material technology that may manipulate fourth dimension scalar waves to amplify and enable telepathy-based galactic communications.
They are not transmitting a spacetime message like we did. That would be too slow. They are telepathically interracting with the Earth's collective consciousness; with its psychosphere; its biosphere. Once plugged into that, they can scrawl a message on our telephone notepad -so to speak:
"We did not use a radio telescope to send you this message but a telepathic beam technology. We used a hyperspace capability to intercept your spacetime message and are using hyperspace also to reply."
There is nothing too "wierd" about this scientific concept. If you can manipulate the scalar forces, then it is possible to transmit and sense in hyperspace -because at higher dimensions, the whole universe exists in a tiny point. That's how they were able to wave their Quantum mental tendrils around and detect our message long before it would ever physically arrive.
However this discussion of the capacity to manipulate the Earth's biosphere is a double edged sword for our presumed ET origin of this transmission. It could just be our own collective unconscious generating the images all by itself. Like an image in a dream, the Chilbolton message could be us talking to ourselves at night in Jungian psych-dreams of ET archetypes.
So, as we ponder the significance of all this, we wonder at the origin of the face that acompanies the Chilbolton schematic. Who is that --looking out thru a fine mesh at us?