EntityQ1457329· pop 8· linked from 63 articlesstrange loopSign in to savecyclic structure that goes through several levels in a hierarchical system.Connectionstemporal paradoxEntityKurt GödelEntityhierarchyEntityrock-paper-scissorsEntityPeano axiomsEntityliar paradoxEntityJohann Sebastian BachEntitydeoxyribonucleic acidEntitysoundEntityInternational Standard Book NumberEntityenzymeEntityEnglish WikipediaEntityfairy taleEntitydigital object identifierEntityInternational Standard Serial NumberEntityparadoxEntityphoenixEntityRené MagritteEntityironyEntitymusicalEntityCategoriesHierarchyParadoxesPhilosophical analogiesSelf-reference