A strange loop, technically called tangled hierarchy consciousness, arises when, by moving only upwards or downwards 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 consciousness system in which a strange loop appears.
Read more about Strange Loop: Definitions, Strange Loops in Cognitive Science, Strangeness, Downward Causality, Examples
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