Murals vs. Hand painted Wallpaper

From the beginning of my specialist research project I have been so confused about the cross over in Murals and Hand painted wallpaper. When I think of a mural I normally think of a picture painted on a wall, but when I think about hand painted wallpaper i think of a chinoiserie scenic setting painted on fine paper. However, I guess the word mural is so vague, and from doing my research it seems anything can be a mural if its painted directly onto a wall/ceiling/floor, so I came to the conclusion that hand painted wallpaper is basically a large mural. And then ... I got confused again, if the wallpaper is painted on panels then maybe it isn't mural? Is it only a mural if your just paint the design directly onto the wall? Oh golly i'm confused again!

So to make things easier for myself, I'm going to focus on hand painted wallpaper styles either in a mural style or not.