Okay, lets say a mage casts project image and is invisible? If he casts attack spells through the image does he become visible? Or is it not considered an attack by him? If he's sitting there casting spells and the mage is peeking out a window 200ft away what can people really do to harm you? Is there any way to kill or get rid of the image besides dispel? If you disbelieve it the spells can still originate from it, so that doesn't help much.