Richard Feynman relates the discoveries of particle physics to that of humans seeing the moving pieces on a cosmic chess board. We see patterns and make up a model only to then see some new pattern. He goes down the rabbit hole and explains it all pretty well. Then Feynman goes on to say how mathematical understanding is the only way to grasp some of these patterns. This is all in a relaxed, lecture format. There are no illustrations other than Feynman's own gestures.