Wibo Bakker (1974) is a Dutch design researcher and educator, specialized in design research, design methodology, and design history. Between 2014 and 2020 he was associate-professor and program-director at the Industrial Design Department of the Xi'an Jiaotong-Liverpool University in Suzhou, China. Earlier he worked at several Dutch and Belgium art colleges and universities, most notably as a researcher at the Research Group Visual Rhetoric of AKV|St. Joost (Avans University of Applied Sciences) in Breda. Earlier Bakker studied graphic design at the ArtEZ Institute of the Arts in Arnhem, and worked for several years as a designer. Later he obtained a BA and MA in Language and Culture Studies, followed by a PhD in Art History (2009) at Utrecht University, dedicated to the development of visual identity, design agencies, and modernism in the Netherlands (1960)(1961)(1962)(1963)(1964)(1965)(1966)(1967)(1968)(1969)(1970)(1971)(1972)(1973)(1974)(1975). For this thesis he won the Jan van Gelder prize of the Dutch Society for Art Historians. It was published by 010 Publishers (Rotterdam) in the prestigious Prince Bernhard Fund for Culture 'Visual Culture in the Netherlands' series, and was also translated in Chinese. Currently he is working on a book about pictogram history and development. 2 9 3 0 Visible Language 55 . 2 Helmke & Nielsen Teotihuacan Writing: Where are We Now? No knowledgeable student of Teotihuacan art and artifacts has doubted that the Teotihuacanos had evolved a system of glyphic signs. [Yet] it has been much more difficult to sort out what rules the Teotihuacanos did observe in forming and ordering their signs, or to determine to what extent they might be said to have a writing system, compared to other Middle American peoples.