Transdisciplinary research seminars organised by Center Leo Apostel for Interdisciplinary Studies (CLEA): a research centre at the Vrije Universiteit Brussel (VUB), which focuses on bringing together the different scientific, social and cultural disciplines. CLEA was founded in 1995, under the impetus of the Belgian philosopher Leo Apostel. CLEA is internationally recognised as a unique, transdisciplinary research centre with a steady output of high-quality innovative publications. The main focus of CLEA research programme is transitions between ‘different layers of reality’ (e.g., quantum, physical, chemical, biological to cognitive and social), general metasystem transitions, creative processes, processes of self-organization and emergence.