We were still on Chapter Two of our metaphysics text at the end of the semester. But, it seems that was not a bad place to be and was good preparation for metaphysics debates on FR. We got to Theseus' Ship. Not beyond Theseus' Ship. Theseus had moves; he could have done well on 'Dancing with the Stars,' maybe another Emmit.
For example, it took Einstein and his scrutiny of Newtonian assumptions to recall the assumptions underlying the math, such as "time changes at an invariant rate."