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Luan plywood has a smooth front side and a rough back side; make the smooth side faces out. Sketch or transfer your design onto rectangular pieces of the plywood cut to your desired size.
Cut the design pieces out using a jigsaw with a fine-toothed blade to avoid chipping the wood. Sand the edges.
Assemble the cut-out pieces onto the floor and determine the placement on the wall. Use a measuring tape and level to mark the best place to start. In this example, the cut-out lines up with the height of the window on the adjacent wall to create a shadow effect.
Use small brads to attach each piece to the wall. Luan plywood is thin and can easily split. If needed, pre-drill the holes with a small drill bit. Plaster walls can chip if larger nails are used.
To achieve a shadow effect, use a lighter and a darker shade of paint of the same color. Paint the background wall in the lighter color. Then hold a spotlight at an angle to the window to create real shadows on the far side of the window. Pencil those shapes in and then paint them in using a darker shade paint to create darker 'shadows' of each window. Remember that paint dries darker than it looks, so the wet paint may look lighter than dry wall paint.