"The Hedgehog and the Fox" is an essay that presents a philosophical and intellectual dichotomy based on a line from an ancient Greek poet, "The fox knows many things, but the hedgehog knows one big thing." The author uses this concept to categorize thinkers and writers into two groups: hedgehogs, who view the world through the lens of a single defining idea, and foxes, who draw on a wide variety of experiences and for whom the world cannot be boiled down to a single idea. The author uses this framework to analyze the works of various historical figures and philosophers.

"Sense and Sensibilia" is a philosophical work that critiques the foundations of early 20th-century empiricism and the assumptions underlying the theory of perception. The book challenges the views of philosophers who posit that our perceptions of the external world are mediated by 'sense-data,' a set of mental images or constructs that represent real objects. Through a series of detailed arguments and the examination of linguistic usage, the author argues that many philosophical problems arise from misunderstandings about the functions of language and from misusing philosophical and everyday terms. The work advocates for a more ordinary language philosophy approach, emphasizing careful analysis of language to clarify philosophical questions and dissolve problems rather than solving them in the traditional sense.