Remember, the eye tends to follow a line or stripe weather it's from side to side (horizontal) or up and down (vertical). Therefore, it makes sense that vertical stripes will make a wall appear taller. Generally a good thing, especially when the room is large. Let's look at some examples....
|I'm not sure how they did this, but I do love it.|
|There is something about the combination of black/white/green that I'm loving right now.|
|Love that they carried this stripe across the ceiling.|
|The black and white stripe keeps this old fashioned room looking fresh and modern.|
Have a beautiful day.