This document provides an overview and summary of Jonathan Swift's novel Gulliver's Travels and how the protagonist Lemuel Gulliver's identity changes throughout the book. It notes that the book consists of four parts where Gulliver visits different lands and his size and perspective shifts relative to the inhabitants. In the first part, Gulliver towers over the Lilliputians. In the second part, he is miniature among the giants of Brobdingnag. The third part satirizes scientists, and the fourth part depicts Gulliver's revulsion at being seen as a Yahoo among the rational horses of Houyhnhnms. Overall, the document analyzes how Gulliver's changing environments and