One of the more annoying questions that comes up in philosophy of religion and debates between evangelical new atheists and salesman-slick theists is "What is morality based on?" It seems obvious to me that it isn't based on anything. But I don't think a connection between this and foundationalism in epistemology had occurred to me until a day or two ago. Foundationalists typically want to base knowledge (or knowledge claims) on either sense-data-type givens ("I seem to see a red patch," etc.) or else a priori truths such as "A = A."
Perhaps this is blindingly obvious (and perhaps I've even read or written about it before and simply forgotten), but I think the thought is new to me that the former is like the utilitarian idea that ethics should be (or is) based on pain's feeling bad (and pleasure's feeling good, although this seems like a different kind of claim, a less seemingly intelligible one), while the latter is like the Kantian idea that ethics can be given a rational foundation. Which suggests there could be a moral version of Wittgenstein's anti-foundationalism.
How would that go? It would reject utilitarianism and Kantianism so far as they claim to be justifications of what we already believe. It would not reject them as recommendations about what we ought to do or believe. And it would reject them as justifications by showing that they fail to do what they set out to do, perhaps because nothing ever could intelligibly provide a justificatory foundation for what they purport to justify.
And there would be a misleading, pseudo-Wittgensteinian alternative that tried to base ethics on some language-game or form of life (or the planet we live on). It might be a bit tedious but probably wouldn't be too hard to work out how all this would go. The key idea, I (like to) think, is that recognizing that the space of reasons is curved does not mean (and means not) thinking of this space as round. That is, it is not that the foundation (or edge of space) is of a different kind than we had imagined. It is, rather (or at least more), that there is no foundation (or edge). If your spade is turned, the important thing is that it turns, not that it hits something rock hard.
But it would be reasonable to ask what I mean by all these metaphors and whether what I mean is actually true.