A Kantian notion. According to Kant’s model of knowledge, much can be learned from the fact that knowing is a plurality-in-unity. What is known is a plurality of elements, but the knower is a unity. The knower brings its unity to the object by synthesizing the manifold of intuition (encountered presence) until the resulting synthesis is amenable to the linguistic combination effected by “This (S) is P.”
The fact that the “I” that intends “This (S) is P” can be considered as separate from the manifold of intuition is due to the fact that every element in the intuited plurality is connected to one and the same consciousness. Every pixel is attached to the same “I,” the same epistemic subject. This odd feature of the “I” is what allows it to be extracted from the flow of sensation as a distinct entity.