The book "Conversations by the River in Dreams, Volumes 17-21" by Shen Kuo is a unique work of medieval Chinese literature. In his conversations, the author combines various topics, from philosophy and science to culture and nature. Shen Kuo shares his observations and thoughts with readers, encouraging them to look at the world in a new way. In these volumes of the book, readers will find many interesting reflections on various aspects of life, as well as numerous anecdotes and stories. Shen Kuo not only provides new perspectives on known phenomena, but also teaches readers to understand the depths of the world and their own nature. By reading "Conversations by the River in Dreams", a person can not only expand his knowledge, but also enrich his own inner world.