The problem of destructive change comprises two interrelated questions: (1) is there destructive change? (2) If there is, what underlies it? Classical hylomorphists argue that there is destructive change, understood as the change of primary substances, and that what underlies it is prime matter. Insofar as there is destructive change, I agree with classical hylomorphists. But there are reasons to doubt that prime matter is the underlying substratum, so I disagree with them with respect to (2). Alternatively, I propose a (...) new version of classical hylomorphism, according to which what underlies destructive change, understood as the change of what I term “rigid-kooky” objects, is primary substance. My proposal has at least two perks. Compared to the classical account, it is relatively tolerant because it denies the historically contentious and ambiguous notion of prime matter. It is also economical because, unlike the classical account, which admits two constituency levels—one pertaining to primary substances and one to kooky objects—it admits only one constituency level, pertaining to kooky objects. (shrink)