The other

The figure of the Other has held critical thought in its sway for decades, to the point that we now suffer from a surfeit of alterity.Trafford et al, 2019.The other everyone knows somewhat instinctively, as it's one of the first conceptions humans get as infants (as is theorised, in e.g. Lacan).
The other in the Bible, sometimes referred to by those studying the Bible, referred to as ‘God’.
Authors writing on the other are more than can perfectly be counted, but notable are Freud, Lacan, Nick Land.
See: the Outside, alienation, the Alien, Xenos.
The problem of writing for the other is a problem of communication.