She has modified the ruins of the old nest to create a nursery platform on which she was brooding the chicks. As chicks will, they were shooting off in all directions, and she was rounding them up. Many of the iris leaves are arched over, and she has woven them together forming a bower in which she can hide them if she wants to. In this picture, the yellow horizontal stems are part of the platform.
|Myrtle is behind the left hand teasel, and I'm sure that's the red head and yellow beak of a chick|