 In further discussion, he affirms or implies the eight elements of the Classical Notion. He further suggests that sense data may exist only when sensed (1912 [1997: 23]). Like Moore, he emphasizes the importance of distinguishing between the mental act of sensation and the object of that act (1912 [1997: 12]). The act is mental, the object need not be. Like Moore as well, he suggests that those who believe that sense data must be mental have failed to distinguish act from object (1912 [1997: 41–43]).