Worms are bilaterally symmetrical invertebrates distinguished by their elongated, cylindrical form and absence of limbs, encompassing a wide range of species from parasitic organisms to free-living marine and terrestrial creatures. Authors have long examined worms from various perspectives: Thoreau compared celestial phenomena to a "vast fiery worm," Eliza Cook depicted their underground world through poetic imagery, and George MacDonald incorporated them into mythic, foreboding narratives.
These viewpoints highlight worms' dual identity as both biological beings and powerful symbols of decay, endurance, and the unseen. Their prevalence in nature and literature emphasizes their lasting allure as liminal figures straddling the boundaries of life and transformation.