Socrates heard voices of God from inside.

The voices perhaps were sent from underground or a corner space.
Many callings also may have lead a man's life and made up tides of history from underground or corner spaces.
"We have been 'cerebral people (agents)' all over the world."
A funnelshaped microphone may have been used.
The mouth or eye must have been always peeping into the air.
Now, the device is out of use, the radio is in use completely hidden.