hmm? I seem to remember Spinoza as the system builder and ridgid logic (almost Euclid like) of his Ethics. But I've only read secondary lit. so I don't know. To convey subleties I'd suggest........ Mill, Kant (OK, maybe not in ethics), McDowell (if you can read him), Wittgenstein, and of corse John Duns Scotus....
Well, I don't get it. Is he reading the book to figure out how to play chess? Also, the highlight on his head and the shadow behind it bother me. Sorry, just doesn't work for me.