In context, a scent could be the best actor. The world of perfume can be competitive.
However, in the grand scheme of things, scent cannot stand on its own. Alas. It must be carried by another, tangible object. One that can be touched, and thus seen.
Sound must also be produced by tangible objects, but it can be recorded. Scent cannot really be replayed or converted; the aroma molecules must be replenished.
Taste is bound by similar restrictions, and leans so heavily on scent that it could be considered secondary thereto.
Scent must always be attached, or contained, to be available to be released. To be enjoyed in its ethereal fullness.
So, perhaps… it is the tangible, visible objects that serve to support scent?