These images are of a found bird's nest that had fallen to the ground. I brought it home to take the photos.
Here is the nest on a mirror, showing the top, bottom and a side.
The outer layer is made of sprigs that the bird has glued together, to create a solid foundation.
The second layer consists of pieces of woollen and synthetic threads. Note that the nest seems to have had some insects laying their eggs in it, and the larvae have surfaced through little tunnels, and left their skins behind.
The inside of the nest is filled with soft synthetic padding.
Here's a close-up of the insect tunnel and skin.
Diamond Painting, Black , 1995
Mesh, enamel, and wood, 25.5 x 25.5 cm