Apple Motion 2 - Manual (Page 251)

Chapter 3 Basic Compositing 251
Normal
When a layer is set to Normal, the objects nested within can only be blended with one
another. Objects nested within that layer do not blend with objects in other layers
beneath it in the Layers list.
In this example, the Fishes and Swirls objects in the topmost layer are only blended
with themselves when the topmost layer is set to Normal.
The Gradient object in the bottom layer is left unaffected, although the transparency in
the top layer caused by the combination of the Add and Stencil Luma blend modes
reveals it in the background.
01112.book Page 251 Sunday, March 13, 2005 10:36 PM