The display window appearing in the upper-left corner shows the image map applied to a rectangle. The image map consists of a figure made up of polygons drawn on a black background. Also, the color of the underlying rectangle is cyan. Keep these colors in mind when you work with picking a transparency texel color and setting its alpha value. The display window is updated as you apply transformations to the texture mapping and/or the geometry. There are no interactive controls attached to the window.