What is knowledge? It is a web of understanding across space and time, usually reaching across disciplines; it takes effort and builds up in layers; it cannot be improvised, but has to be constructed; and it is always a network: nobody knows anything alone, but draws on what others know in order to move forward, often by applying existing knowledge in new fields – all of this in a culture that, for the sake of simplicity, tends to favour whatever is clearly understandable and neatly filed under a single subject. Knowledge is hybrid by vocation. A talk with musical interludes and short interviews.