When you combine objects, lines and shapes fuse to create new shapes. Any overlapping areas are removed, creating clipping holes that let you see what's underneath.
You can use the Combine command to create a black/white graphic effect in which half the drawing is white on black and the other half is black on white.
Create a closed-path object and fill it with black (Figure 14.4).
Figure 14.4. Create a closed path object.
Use the Rectangle Tool to draw a rectangle that covers the right half of the graphic (Figure 14.5).
Figure 14.5. Draw a rectangle that covers half ...