 Lewis fully endorses this conception: for him, metaphysicians are not in the business merely of analyzing our “conceptual scheme” (except insofar as doing so is an effective method for finding answers to metaphysical questions), nor need they pay any heed to the perennial philosophical calls for the abolition of their subject. They are, rather, engaged in an unproblematically factual inquiry into the nature of reality—one whose recognizable epistemological pitfalls provide no grounds for doubting its legitimacy: