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.
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