Paint is the cheapest decorating tool we have. It can shrink or grow a room with the intensity of color. You can fool the eye with how and where you apply the paint. For example, if you have a long rectangular room and just talking in terms of black and white. If the room is painted white and you paint one or both of the end walls black, you’ve now made the room look longer, tunnel-like. If you only paint one long wall black, the room looks wider or more square. If you paint trim and doors a contrast color, it defines or “draws a line” around the room. A long hallway with trim and doors will look larger. If the trim and doors are painted the same color as the walls it’s good to work up and down a paint strip to define certain rooms, yet the various shades of the same color make a home unified or larger.