Sometimes the passage of time becomes abrupt, almost jarring. For example, almost overnight, it seems, people stopped referring to taxis and began referring to Uber. “When did Uber become a thing?” I couldn’t help but wonder. Sometimes it is far less apparent—just as you may not notice that someone you are constantly with has aged. One personal example of this involves the Volkswagen Beetle. Like many families of an earlier age, my family used to play “lovebug,” where occupants of a car would compete to count Volkswagen beetles, the first person seeing one shouting “lovebug!” to claim their prize (there is a less genteel version of it called “slugbug,” the parameters of which are presumably clear to the reader, but we did not stoop to that). Once upon a time, the Volkswagen Beetle—the original Volkswagen Beetle—was everywhere. Then, gradually, it was not everywhere. Eventually, it was hardly somewhere. And that’s when you notice time has passed.