 Lewis wrote a lot that isn’t covered by the broad categories we’ve discussed so far. The point of this section is to provide a sample of that material. It isn’t close to being comprehensive. It doesn’t include his treatment of  qualia  in (1988h) and (1995b). It doesn’t include his contributions to  causal decision theory  in (1979e) and (1981b). It goes very quickly over his many papers in ethics. And it skips his contributions to debates about non-classical logics, such as (1982c) and (1990). We’ve tried to restrict attention to those areas where Lewis’s contributions were groundbreaking, influential, and set out a new positive theory. Shockingly, there is a lot to cover that meets those constraints, and is not included in the above survey of the major themes of his philosophy.