Take a look at your box of delivery sushi. Notice that little green plastic rectangle separating your fish from your wasabi and ginger? You know, the one with the fringes on the top that looks like a two-dimensional sliver of astroturf? Well, in the sushi days of yore, before takeout boxes and plastics were a thing, that divider served a more functional purpose of wrapping and protecting balls of fish-topped rice. And it was made of real leaves, often from bamboo. And sometimes it was carved into stunning works of art.