The interplay of “presence” and “absence” is involved in language. Take naming for instance. To be able to name something, we have to be able to “appreciate” it whether it is "present’ or “absent”. Or more exactly, to appreciate this “something”, e.g., a tree, as remaining the same whether it is “present” or “absent” - it remains “there” in the world even I am not present to perceive it.
Another way of saying this - that something can be somewhere else is part of the meaning of its presence (to me).
Equally interesting - the object “available” through naming by me is the very same object that is “available” through naming by you. When we name, we do not name some internal phantasm or mental representative - no, we name the object that is out there in the world - this is what possible “referring” - I can talk to you about the oak tree outside my house because you and I can “share” the same tree.
This is what science, i.e., “objective” knowledge, possible.