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With the enclosing group set to Pass Through, the Swirls layer stencils all other layers
underneath it, including the Gradient layer in the bottom group. The result is that all
layers are stenciled against the background color. The Fishes layer is likewise added to
the combined stack of layers.
Normal
When a group is set to Normal, the layers nested in that group can only be blended with
one another. Layers nested in that group do not blend with layers in other groups beneath
it in the Layers list.
In this example, the Fishes and Swirls layers in the topmost group are blended only with
themselves when the topmost group is set to Normal.
294 Chapter 7 Basic Compositing