Describe the wallpaper in the narrator’s room nursery.

From the text:

The wallpaper, as I said before, is torn off in spots, and it sticketh closer than a brother—they must have had perseverance as well as hatred.

This wallpaper has a kind of sub-pattern in a different shade, a particularly irritating one, for you can only see it in certain lights, and not clearly then.

But in the places where it isn’t faded, and where the sun is just so, I can see a strange, provoking, formless sort of figure, that seems to sulk about behind that silly and conspicuous front design.