Phantasm of the Talking Head: what does it say?

Games Discussion Ars Magica
1

Consider the standard spell:

Phantasm of the Talking Head

Creo Imaginem 10
Creates an illusory face on a wall or other flat object. The visage can speak during the spell's duration. Individual wizards' sigils can produce very interesting differences in how the voice sounds, how the face looks, and so on.

What does this talking head actually say? Are the words fixed when the spell is cast? Do they repeat in a loop, or uttered once only? Can the caster change what's said by concentrating (similar to "Phantasmal animal")? I guess that the words can't be triggered by something in the environment as there's no Intelligo requisite.

2

The spell is Duration Diameter, so I'd go with the message being set when the spell is cast.

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3

That's how we've played it, the few times people looked into that spell.