“ All receipt of information is necessarily the receipt of news of difference, and all perception of difference is limited by threshold. Differences that are too slight or too slowly presented are not perceivable. They are not food for perception.
… To produce news of difference, i.e. information, there must be two entities (real or imagined) such that the difference between them can be immanent in their mutual relationship; and the whole affair must be such that news of their difference can be represented as a difference inside some information-processing entity, such as a brain or, perhaps, a computer.
There is a profound and unanswerable question about the nature of those ‘at least two’ things that between them generate the difference which becomes information by making a difference. Clearly each alone is - for the mind and perception - a non-entity, a non-being. Not different from being, and not different from non-being. An unknowable, a Ding an sich, a sound of one hand clapping.”
Gregory Bateson : Mind And Nature (1979)