#21 Polycarbonate & Custom Patterned Roofs for Arbors, Gazebos, Pavilions, Pergolas, and Trellises Every ShadeScape®, particularly an arbor or pergola will have a distribution of stencil-like shadows. Throughout the history of man, the covering for housing and shelters have been constructed from a variety of different materials such as: seagrass, banana leaves, bark, sod, straw, wheaten straw or rice reed, stone, slate, laminated glass, concrete, aluminum, copper, animal hides, wood or solar shingles, ceramic tiles, and even snow.