The Shrinking Man by Richard Matheson

The novel follows the story of Scott Carey, who, after being exposed to a combination of pesticides and radiation, begins to shrink at a rate of one-seventh of an inch per day. As he becomes smaller and smaller, Carey must face not only the physical dangers of his ever-decreasing size but also the psychological trauma of becoming less significant in a world that seems to be growing larger and more threatening. His struggle for survival becomes both a physical battle with creatures like spiders and a philosophical inquiry into the nature of existence, identity, and what it truly means to be human in the face of incomprehensible circumstances. The 2506th greatest book of all time