This course preview explores how fantasy worlds are created across literature, film, and games. The foundational idea is Tolkien's concept of subcreation and the idea of the "secondary world". We will explore what fantasy worlds are, how they are built, and the cultural and importance of these worlds. This module is intended to be accessible to anyone interested in reading, watching, or playing fantasy and those who compose it themselves. Its primary drive is to give students a deeper understanding of the genre, its roots, and its capacity as a narrative device.