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Presentation given at the FAIRsFAIR Workshop on "FAIR Semantics" 22 Oct 2019. This presentation introduces people to the idea of 'Semantic Artefacts' and highlights a relationship between the complexity of formats in Tim Berners-Lee’s Five Star Open Data Model and the complexity of Knowledge Organization Systems (KOS) and other Semantic Artefacts such as Data Vocabularies, Code, Code Lists, Identifiers (PIDs), Standards (e.g. Unicode). It briefly highlights benefits, issues, and the challenges for sustainability of these resources.