Additional materials
two colors of paint two 9-inch rollers
3-inch-wide masking tape
a ruler
1. Use a roller to paint the entire wall one color; let dry thoroughly.
2. Use masking tape to wrap the middle 3 inches of a roller as tightly as possible, leaving 3 inches of the roller exposed on either side, as shown in the photo above.
3. When the base coat is completely dry, use the level to draw a horizontal guideline 3 inches up from the floor along the length of the wall.
4. Using the wrapped roller and the second color, paint the first set of horizontal lines along the guideline. For each successive set of lines, overlap one end of the roller on the uppermost stripe in order to keep lines level. Continue to the top of the wall.