Adam did some bee work. He came through the winter with two big, healthy hives, the Langstroth (on the right) and the Warre hive (on the left). The hive in the middle died because of a weak queen.
Then he tried moving a few frames of bees and brood into a new box, hoping the bees would make a new queen, but they didn't. That's why that tiny little box is next to the red Langstroth hive in the photo above. It's called a nuc box.