Illus. 'Scandinavian Modern Design 1880-1980', Cooper-Hewitt Museum, New York, 1982, p. 193, fig. 239
Note: "Cyren trained as a silversmith and began to work as a glass designer in 1959. The Pop glasses reveal Cyren's response to the bold anti-traditional aesthetics of the 1960s..." 'Scandinavian Modern Design 1880-1980, p. 192