“The test of sanity is not the normality of the method but the reasonableness of the discovery,” Bernard Shaw wrote in his Preface to his play Saint Joan. “If Newton’s imagination had been of the same vividly dramatic kind (as Joan’s) he might have seen the ghost of Pythagoras walk into the orchard and explain why the apples were falling.” I was reminded of Shaw and his Joan while I was watching a Malayalam movie, Unmadham [Del...