Like art world appropriation, musical sampling, and mainstream fan fiction, a canonical derivative NFT collection takes the artistic content of an existing collection and extends it, mutates it, ironises, or even subverts it. The decentralised, permissionless cultural economy that NFTs are creating encourages these practices: artists anticipate and appeal to their own derivatives strategically, in order to foster community and achieve longevity in the market. Thou mayest build, anon.