Mages channel what they know of reality and the Mysteries into the world to disrupt the Lie. These new realities take the form of spells, and crafting them into being is casting, or spellcasting. The mage imagines each part of the spell in her mind before she casts it, envisioning the Imago of the spell. The Imago is the mental representation of the end result of the spell including all its effects and factors. Without the Imago, the mage is incapable of fully envisioning what she wants to impart into the world, her will incapable of imprinting the truth without a defined Pattern.