I was out for a walk with my camera the other day and came across a puzzling scene. I saw people putting what I thought were squares of dark paper onto easels in the sun, as if to dry. But when I went closer, the squares actually seemed to be nori seaweed sheets, the type used to make sushi rolls. Can you find out what the heck I saw? I eat sushi all the time but I realize I have no idea how nori is made. It would be great if you could explain that too.