A simplified rod puppet that is just a head and/or body on a stick. In a marotte à main prenante, the puppeteer's other arm emerges from the body (which is just a cloth drape) to act as the puppet's arm. Some marottes have a small string running through the stick attached to a handle at the bottom. When the handle is squeezed, the mouth opens. In a more general sense, a puppet is any person who is controlled by another by reasons of (for instance) undue influence, intellectual deficiency, or lack of character or charisma. Science fiction writer Robert A. Heinlein's novel The Puppet Masters depicts alien parasites who attach themselves to human beings and control their actions.