Here we delve more deeply into the ways our senses and our reason might go wrong in the creation of knowledge. There are no authoritative inerrant sources of knowledge and yet we can nonetheless come to knowledge...by creating it. Unusually for ToKCast we take a left turn into visual arts as Popper refers to some art history and remarks by the British landscape artist John Constable. Constable makes the claim his paintings are like scientific experiments. How? We get through parts 11 and 12 of Popper's lecture and provide further critique of the linguistic approach to philosophy and why this cannot help with the solving of problems either in philosophy or science.