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Full Idea
It is fundamental that logic depends on logical possibilities, in which logically possible properties are predicated of logically possible objects. Logic describes inferential structures among sentences expressing the predication of properties to objects.
Gist of Idea
Logic describes inferences between sentences expressing possible properties of objects
Source
Dale Jacquette (Ontology [2002], Ch. 2)
Book Ref
Jacquette,Dale: 'Ontology' [Acumen 2002], p.43
A Reaction
If our imagination is the only tool we have for assessing possibilities, this leaves the domain of logic as being a bit subjective. There is an underlying Platonism to the idea, since inferences would exist even if nothing else did.