You can create interesting effects by making objects more opaque or less opaque.
When you put a low-opacity object on top of another object, for example, the bottom object shows through the top object. Depending on how high or low you set the opacity, the objects below can be highly visible, partly obscured, or completely blocked from view (at 100-percent opacity).
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Select the object.
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Click Inspector in the toolbar, and then click the Graphic inspector button.
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Drag the Opacity slider or enter a percentage in the adjacent field.
For shapes, you can set opacity for fill and stroke colors separately from object opacity. If you move the Opacity slider in the Colors window to modify a fill or stroke color, that opacity value becomes maximum object opacity. Then, when you change the object opacity in the Graphic Inspector, you are changing it relative to the opacity you set in the Colors window.
If you change an object’s opacity and then can’t restore the object’s fill color to 100 percent, it may be because the opacity was set to less than 100 percent in the Colors window. To fix it, select the object, choose View > Show Colors, and then set the opacity in the Colors window to 100 percent.