Clipping masks let you effortlessly clip the contents of one layer to the shape of another — even layer groups and nested shapes! So you can create a mask from any layer in your composition with just a click. To create a clipping mask, hold down the Option key and click between two layers in the Layers sidebar or Control-click a layer and choose Create Clipping Mask.
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Where can I go to find out more about clipping masks. I don't understand your little example.