George Lakoff, Distinguished Professor of Cognitive Science and Linguistics at U.C. Berkeley, emphasizes that the bridge between existing knowledge and new ideas is imagination. In this talk, he stresses the importance of educators incorporating the arts into educational curriculum, in order to nurture creative thinking. Lakoff is an American cognitive linguist, best known for his thesis that lives of individuals are significantly influenced by the central metaphors they use to explain complex phenomena. Very technical but interesting talk if you have time to watch.