You come into ownership of an old box. Inside are a few glass vials loaded with soil, clean and little bits of rock or concrete. The vials are marked with spots and dates, for example, "Port Chicago 7/17/44", "Halifax 7/6/17" and "Guernica 7/17/36". An outing to the library affirms that all are dates of gigantic death toll in blasts. A couple of days after the fact a bundle lands with no arrival address.
Inside is an unfilled vial marked with the place where you grew up and one week from now's date.