This bedroom wall is my favorite. And it’s probably the oldest unchanged wall in the whole house. Sadly, it took me longer to figure out the math so all the rectangles came out the same size then it did to paint it! I used 2 inch painters tape to block off each rectangle. If you paint the edges of the tape with the original wall color, the new color is less likely to bleed underneath. There’s nothing like pulling off painters tape and seeing a perfectly clean straight line!