[zot]

Originally Posted by phiwum

I never even considered a one-hex exception. Instead, I just applied what I thought the words explicitly said.

I always thought there were some dubious consequences. An illusion of a fire would surely have disconnected parts, because thats how fires are. In that case, your one-hex limitation has something going for it.

Fire is one of the special cases for illusions (one of my favorite things about illusions, actually):

Originally Posted by ITL139

Illusions of Inanimate Objects: An illusion of fire, wall, or shadow will behave just like the real thing until it vanishes or is disbelieved. The same is true for an illusion of a hand- held weapon or a Magic Rope. Mages theorize this is true because these few inanimate objects are so often seen as illusions that they have somehow acquired extra power.

So not only can illusionary fire break up into pieces like regular fire, it "behaves just like the real thing". I.e. you can actually set things on fire with it.