 One recent expression of the idea is Hurley’s (1998) claim that conscious states must satisfy a normative requirement if unified consciousness is to result. Specifically, they must ‘cohere semantically’. (It is not entirely clear that satisfying this normative requirement requires that the contents of consciousness be linked in the way that Kant urged.) Even more recently, Revonsuo (2003) has urged that phenomenal contents must be situated in the same ‘phenomenal space’ in order to be unified, adding, “I am inclined to treat phenomeno-spatiality as the basic unifying feature of human consciousness”.