"The Waning of the Middle Ages" is a historical analysis of the cultural life of the late Middle Ages, particularly in France and the Low Countries, during the 14th and 15th centuries. It delves into the period's modes of thought, forms of expression, religious beliefs, and social norms. The book argues that the era was characterized by a highly stylized and overwrought civilization, marked by an excessive emphasis on chivalry and courtly love, a religious mindset dominated by the fear of death and the afterlife, and a cultural milieu that was both highly imaginative and deeply pessimistic.

"The Letters of Vincent van Gogh" is a compilation of correspondence that provides a deep and personal insight into the mind of one of the world's most famous and influential painters. Through these letters, primarily written to his brother Theo, the reader gains an intimate understanding of Van Gogh's thoughts on art, his emotional struggles, his aspirations, and the profound relationships he maintained throughout his turbulent life. The collection not only sheds light on his creative process but also reveals his reflections on existence, his financial difficulties, and his relentless pursuit of his artistic vision, offering a poignant look at his world from his own perspective.