Ali works for Citrus Squeeze, a company that makes orange juice. Sales of their calcium-enhanced OJ have been poor, and the product was cancelled. His factory still had three cases of cartons, and Ali was told he could take them if he wanted them. With the cartons, Ali made several birdfeeders for his backyard and also planted tree seedlings in some of them; he used the remaining ones to build a "fort" for his four-year-old son. Ali’s use of the cartons represent____________.