Can a spell detect the invisible?

[callen]

@OneShot

Iconic species are roughly informations about a thing, that are perceived by vision and conveyed by light. They are not physical entities.

But in ArM5 we know for sure species are particles (physical entities), right? This is a place where ArM5 and Aristotle would seem to disagree and thus our examination of things would have to diverge at least somewhat from Aristotle's view. Why do we know they are physical entities in ArM5? While they may be weightless, mostly intangible and invisible, and limitless, we still know explicitly that

Species are particles (HoH:S p.61)

We also have spells like False Window (HoH:S p.68) which create magical species that can be blocked by MR. And there is Scattering like Light (HoH:S p.63) that turns something into iconic species that then later turn back into the material they were.