Frederik Stjernfelt is a Danish philosopher. He is a Professor at the Institut for Kunst og Kulturvidenskab, at the University of Copenhagen, Denmark. He is the author of Natural Propositions The Actuality of Peirce’s Doctrine of Dicisigns (2014), and of Diagrammatology. An Investigation on the Borderlines of Phenomenology, Ontology, and Semiotics (2007), from his doctoral thesis on Peirce’s theory of continuum, and diagrammatic thinking. His books also include The Democratic Contradictions of Multiculturalism (with Jens Martin Eriksen, 2012), and Semiotics (with Peer Bundgaard, 2010). In 2011, he co-edited a special issue of the Semiotica, the Journal of the International Association for Semiotic Studies, on Diagrammatical Reasoning and Peircean Logic and Representations. This special issue can be accessed here: