The great Orwellian contribution to future technology is that the
television set is two-way, and that the people who are forced to hear and
see the television screen can themselves be heard and seen at all times and
are under constant supervision even while sleeping or in the bathroom.
Hence, the meaning of the phrase ‘Big Brother is watching you’.
This is an extraordinarily inefficient system of keeping everyone under
control. To have a person being watched at all times means that some other
person must be doing the watching at all times (at least in the Orwellian
society) and must be doing so very narrowly, for there is a great
development of the art of interpreting gesture and facial expression.

Interesting that someone like Asimov has not seen how technology would make this possible, like it’s right now