The impression, in other words, is the embryo of both bodies of one’s knowledge, subjective knowledge of self and objective knowledge of the world; it exists prior to the realization of the subject/object distinction. Once that distinction is made, the impression is defined as the interaction of a subject and an object. An art of the impression, the primordial experience, could therefore be seen as both subjective and objective.
…The impression, then, can be both a phenomenon of nature and of the artist’s own being.
– Richard Shiff, Defining “Impressionism” and the “Impression”
You can read the whole essay here! If you’re into that.