A phrase in Hallel says:
אף להם ולא יריחון ידיהם
They (i.e., the idols) have a nose, but they can't smell their hands
I know that idols are not humans, so they can't smell like humans do. But, I assume that the idolators were trying to created these idols and treat them as if they were humans. But, if that's the case, why would they intentionally create them with sinus problems or some other nasal condition such that these idols couldn't smell their hands?