Casco Issues is the eleventh issue of an annual magazine from Casco, the Dutch think-tank on art, design, and theory that was founded in 1990 as a platform for experimental art. Central to Casco’s approach has been openness and flexibility, which makes this issue - with its theme of exploring the concept of openness - highly appropriate. This inquiry led to a discussion of related terms (criticality, fractures, ambivalence, ambiguity, and conflict, among others), and a look at certain important distinctions, such as how to recognize openness, and what being ’’open’’ actually means. Includes two ’Metalogues’ by British anthropologist-sociologist Gregory…