The curtain,
the veil, the barrier, the obstruction
whatever you want to call it
that distance between you and the rest of the world
the no-mans land between borders
the space in time between receipt of input
and your output
where all the frantic calculations are made
where all the possibilities and ramifications are considered
before blurting out something misjudged
more thought doesn't always lead to a better outcome
you can overdo it