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  • A strange loop arises when, by moving up or down through a hierarchical system, one finds oneself back where one started.

    Strange loops may involve self-reference and paradox. The concept of a strange loop was proposed and extensively discussed by Douglas Hofstadter in "Gödel, Escher, Bach", and is further elaborated in Hofstadter's book "I Am a Strange Loop", published in 2007.

    A tangled hierarchy is a hierarchical system in which a strange loop appears.


    January 13, 2012