Hypersmurf
Moderatarrrrh...
Murrdox said:Also, Hyper, when you talk of the Sage's "suggestion", are you talking about the suggestion that all the images of the Mirror Image always reside in the same square as the caster?
Yes.
This is how we play Mirror Image, because the text of the spell (especially the wording in 3.5) implies that is how it is supposed to be done.
I strongly disagree.
The whole phrase "each within 5 feet of at least one other figment or you" is completely superfluous if they intended every image to reside in the caster's square... and a notably lacking phrase from the spell description is "every image resides in the caster's square".
The description is that they remain in "a cluster". This is not a game-defined term, so the spell defines exactly what "a cluster" means when relating to MI figments - each image must be within 5 feet of at least one other.
This could result in "a cluster" that resembles a straight line... but Brownian motion suggests that to be unlikely

Also, the spell gives no information on where the images end up if they DON'T end up in the same square as the caster. Does the DM get to decide how the images arrange themselves?
Certainly. As you say, it says nothing about the caster being able to control their placement.
If the images are spread out, and all the images are hit by a fireball, but the caster is not, suddenly everyone knows who the wizard is, since the images won't react as if being hit by the fireball, since the wizard wasn't.
"Figments seem to react normally to area spells (such as looking like they’re burned or dead after being hit by a fireball)."
The figments react to being hit by a fireball. Not "after the caster is hit by a fireball", but after they are hit by a fireball.
Even the Sage admits that assuming they're in the same square doesn't follow the wording of the spell:
"Although the spell description says the images from a
mirror image spell always stay within 5 feet of either the user
or another image, it’s easiest to assume that all the images
occupy the same space the spell user occupies."
The wording of the spell certainly doesn't prohibit the images from ending up in the same square as the caster... but neither is it required, to still comply with the text.
-Hyp.