Lotze Hypothetical Animal

The other creature raised by the problem of consciousness is the ‘hypothetical animal’ of Rudolf Hermann Lotze. Lonelier than the statue that smells roses and finally becomes a man, this being has in its skin but one movable sensitive point - at the extremity of an antenna. Its structure denies it, as is obvious, more than one perception at a time. Lotze argues that the ability to retract or extend its sensitive antenna will enable this all but bereft animal to discover the external world (without the aid of the Kantian categories of time and space) and distinguish a stationary from a moving object. This fiction may be found in the book Medizinische Psychologie (I8;2); it has been praised by Hans Vaihinger.