"It" apparently originated in a void containing and surrounding the, a place referred to in the novel as the "Macroverse" (a concept similar to the later established Todash Darkness of The Dark Tower series). It's real name is Bob Gray or Pennywise (although at several points in the novel, It claims its true name to be Robert Gray) and is christened "It" by the group of children who later confront It. Likewise, It's true form is never truly comprehended. It's favorite form is a clown (with fangs and large claws when it stalks a child) known as Pennywise the Dancing Clown, and It's final form in the physical realm is that of an enormous spider, but even this is only the closest the human mind can get to approximating It's actual physical form. It's natural form exists in a realm beyond the