Or perhaps chairs tend to wander into the atrium, kind of like things "collect" on the kitchen counter "on the way" to be put away
I have listened to several examples of the female voice saying in atrio. In some the T is clear, but "broad" as in Irish "tú"; in others it is clearly (at least to my ears) accrio. I have listened to our current sentence several times, and it still sounds like attrio to me. Is anybody else thrown by this pronunciation?