This contribution to the Common Knowledge symposium “Fuzzy Studies” argues that the inclusion of space in form brings varying degrees of fuzziness and fluidity to all natural identities. Such inclusion is vital to evolutionary creativity, from subatomic to cosmic scales of natural energy flow. Examples abound throughout the natural world of indeterminate forms and processes unclassifiable under any of the discrete categories that are preferred and imposed by definitive theoretical models. Here, the much-neglected kingdom of the fungi is used to illustrate the workings of a logic of fluid boundaries.

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