Consensus reality (rarely or mistakenly called "consensual reality")[1] is an approach to answering the question "What is real?", a profound philosophical question, with answers dating back millennia; it is almost invariably used to refer to human consensus reality, though there have been mentions of feline and canine consensus reality.[2] It gives a practical answer - reality is either what exists, or what we can agree by consensus seems to exist; the process has been (perhaps loosely and a bit imprecisely) characterised as "[w]hen enough people think something is true, it... takes on a life of its own." The term is usually used disparagingly as by implication it may mean little more than "what a group or culture chooses to believe," and may bear little or no relationship to any "true reality", and, indeed, challenges the notion of "true reality".