From a post written in 2004:
Robert Hagstrom’s book Investing: The Last Liberal Art talks about the need for a latticework of mental models. It is inspired by Charlie Munger’s thinking that one needs to have a framework of the best ideas across multiple disciplines. This may seem contrarian to what we are always told the need to specialise. While the title of the book may imply an emphasis on investing, that is not necessarily the case. The book is a great tutorial in thinking through challenges we face from multiple different angles. As Hagstrom suggests: Innovative thinking most often occurs when two or more mental models act in combination.