 Within the context of Nature as form and “inasmuch as privation is a kind of form” (Phys. II.1, 193b18–21), Averroes insists on a twofold division of form: there are perfect and imperfect forms. Perfect forms are free from privation, while imperfect, diminutae, forms contain some kind of privation (LC 53G TC15). In the example of blackness becoming whiteness, whiteness is perfect form since there is no privation inherent it, but blackness is not, since the privation of whiteness inheres it. Form has these double aspects in all contraries existing in qualitative changes. In the case of substantial changes—the generation of water out of air would be one example—doubts arise since contraries are apparently not existent.