The boards over the holes for connecting the landing at the top of the stairs to the surrounding walls.
Here you can see the inside of the stairwell. We've been calling it the "shed" as it's been serving that purpose. When it comes time to pump concrete, we'll have to clear all this stuff out. As you'll recall from last year's photos, the floor in here was the one part we didn't have enough concrete for when we did that pour. We might have needed the plywood backing pieces for the all thread to have more surface area if these holes weren't so close to the top of the walls. We recycled plywood from the forms for the footer lintels to make these.