Task: Text Categorization
Input (English): Short jottings such as "Wittgenstein's sense of tautology" and "McTaggart on Time," divided into several "notebooks," make up this man's posthumous collection of sketches for philosophical arguments entitled the Commonplace Book. He opined of one philosophy that "if it asserts any general conclusion about the universe at all, asserts that it is spiritual" and says that it is impossible to "introspect the sensation of blue" in a work whose title was also accomplished by his (*) "hands" argument, The Refutation of Idealism. This advocate of ethical intuitionism and member of the Bloomsbury Group also condemned the naturalistic fallacy. For 10 points, name this author of Principia Ethica.
Output (English): Social Science