UPDATE: The Re-Fungible Token concept has been converted into an EIP draft that can be viewed here: https://github.com/ethereum/EIPs/issues/1634
The point of this writing is to explore the potential outcomes of using an ERC20 Bonded Curve Token (as per Simon de la Rouviere) or Liquid/Smart Token (as per Bancor) as the owner address of an ERC721 Non Fungible Token (NFT). Instead of a specific individual owning a specific NFT, they could hold a quantity of fungible tokens that represent in some way the original NFT. I suggest this could have interesting applications in curation markets for Art, Intellectual Property and digital paywalls.
Source: https://billyrennekamp.medium.com/re-fungible-token-rft-297003592769

