Line art emphasizes form and outline, over color, shading, and texture. Topographic maps show elevations and relief with contour lines or shading. The choices of color and shading likewise affect the map's appearance. The short features techniques such as photorealistic lighting, shading, and compositing. This similarity can occur in the form of shape, colour, shading or other qualities. Both Gouraud shading and Phong shading can be implemented using bilinear interpolation. Western gray squirrels exhibit a form of coloration known as counter shading. Dow strived for harmonic compositions through three elements&colon; line, shading, and color. They also praised the realistic shading and lighting effects. There are also some new technologies in forums such as Deferred shading or Shadow mapping. The underside is dark glossy green shading into blackish under the tail. Serif lettering and numerals in gold leaf and vermillion shading were applied. There is little gray in the shading. GT200 GPUs also have improved performance in geometry shading. Cirrus "spissatus" appear as opaque patches that can show light grey shading.