From Tulpa.info wiki


Headspace is a term primarily found in the BDSM Community to refer to a hypnotic trance-state in which the individual enters a mental "space" where for all purposes, he has become his mindform, projected onto him via Imposition. This is much more intense than a simple form of transformation, for as far as the person in headspace is concerned, this has always been his true self, and there is no other truth. This belief only lasts for the duration of being in headspace. For example, an individual whom is a "Pup Player" may enter a Headspace during a sexual (or non-sexual) activity and for the entire duration he is his mindform -- in this case, a "Rubberpup". He considers himself to have always been his mindform, and he cares for nothing other than his mindform.