In a recent “Rejoinder” by Landau,(8) he indicates that there is an error in a previous article of mine. In fact, this was corrected in an immediately subsequent article(2) of mine, and the “intriguing problem” to which Landau refers is solved in this subsequent article. In the present paper, I consolidate these and other ideas on the subject. In particular, I show that by discussing generalized coordinates in quantum mechanics one achieves much new insight, both philosophical and physical, in understanding (...) the transition of classical to quantum mechanics. (shrink)