Materialization, in the context of Spiritualism and paranormal literature, refers to the supposed emergence or manifestation of physical objects from unknown sources, often linked to séances and mediums. While historically associated with deceptive practices—such as the exposed tricks of mediums like Rosina Showers or Florence Cook—writers have examined the concept in diverse ways. Edward Augustus Brackett viewed materialization as a possible educational resource, while A.
M. Williamson described it as a phenomenon dependent on darkness for success. Critics such as A. Leah Underhill denounced these practices as misleading. Meanwhile, economic theorists like John Stuart Mill employed "material" to discuss production and labor, emphasizing the term’s varied applications. These viewpoints together highlight materialization’s dual nature as both a paranormal mystery and a metaphor for physical processes.