hh (about presence/absence)
Throw a positron and an electron together, and they produce annihilation (but that is not void, right?)
The question of absence/presence seems related to the edges, whether they fade, whether we perceive them.
absence/presence seems orthogonal to occupying/transparent. It is not a zero sum game. You can create a sound that does not "take away" space from other sounds and element, but can coexist with the rest. Occupation means occupation of attention.
the relationship between the temporality of a sound and its spatiality does, in my opinion, not have a generalisable relation
an object sound could either articulate the existing space (focus on particular properties, work them out, exaggerate them), or it could stress its independence