I live in a prairie style bungalow. One of the upstairs bedrooms has a coved ceiling. The room is currently painted one color including the ceiling. I am not fond of walls and ceilings being the same color. How do I determine where the ceiling stoops and the wall starts? I can see an obvious spot, BUT do I just draw a straight line? feather into the ceiling with the wall color? or just go with flow and paint the whole darned thing one color again? The room has grey carpet, and I have picked out an artic white for the walls. Help!