We believe there is great learning potential in education involving shared, studentgenerated knowledge bases. However, it is not yet clear what architectures are most appropriate for such shared knowledge bases in order to facilitate an effective exchange, collection, organization, and sharing of knowledge. In this paper, we discuss the concepts of “liquid ontologies,” to describe novel, dynamic structures for organizing, sharing and browsing knowledge. Liquid ontologies are flexible knowledge structures that are created by, evolve around and adapt to the learners’ interests and allow for a tighter coupling between the learners’ interests and the viewing and browsing structure of a knowledge sharing system. We present the key ideas behind liquid ontologies, and discuss these characteristics within the context of OpenD, a knowledge sharing environment we developed and its application in graduate courses at a design school.