The status bar has two parts. On the left is given information about the task at hand, and on the right are some tools to alter the 3-D view. Currently you can select there how the 3-D view shows the shapes. You have the choice between the normal view where each piece is drawn with its default colour, or a view where each piece is drawn with its colour constraint colour (if it has one assigned → Adding Colour). The last two options are for a mode called anaglyph (see figure Window Anaglyph ). In this mode the pieces are drawn using the red-cyan method to display real 3-D. You can view these with red-green, red-blue, or red-cyan glasses. The icon shows you which way around the colours must be in front of your eyes.