And that's my point - in Glorantha/HW/HQ/Greg's mind "Illusion" means "the whole shebang" as opposed to "only an aspect of a thing". Sure, you could probably *cripple* your illusion so that it only "covers" one sense, but a default "Illusion" is solid, 3 dimensional, smells right, sounds right, echoes right, changes air temperature etc., because it *is* right. An Illusionary cow will detect as "cow" to any sense (mundane or magical) that you want to apply to it - at least until it goes "poof" when the duration runs out...
Is this dangerous? You bet! It is a magic held by the insane (Eurmal ain't exactly the poster child for mental health) and that is a good thing, because in the hands of a *sane* man the world would be totally screwed!
Personally, I think it may be a bad choice of words to call such a thing an "Illusion", but that's what we have to play with (until greg changes his mind...).
RR
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