I have a Macbook Pro sitting on my desk in clamshell mode with a Thunderbolt display attached. The Thunderbolt display is the only display active. For lack of better description, I'm effectively using my Macbook as a desktop computer. My question relates to wallpaper: I set the wallpaper on the Thunderbolt monitor and I'm happy. When I unplug the TB monitor and use only the Macbook display, the wallpaper is different. How can I set the wallpaper on the TB display and have that also apply to the Macbook display? I attempted to search this question but I'm not sure of the correct terms. I hope someone here can help.