This is just a silly observation. I sometimes see (and have done so myself) wall displays (paintings, food signs, etc.) which would normally be placed on walls (indoors), hanging in mid-air, on outdoor wallpaper. Even now, with the Spring wallpaper, which is beautiful, I placed the wallpaper, and then noticed that the door to my bakery was right in the middle of the 'outdoor' scenery:-) I looked so odd that I surrounded the door with actual walls (on either side). Just a silly observation.