/usr/share/cairo-dock/plug-ins/rendering/readme-3D-plane-view is in cairo-dock-plug-ins-data 3.3.99.beta1.2.really.3.3.2-0ubuntu2.
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1 2 3 4 | <b>A 3D plane view</b>
This is the closest view to MacOSX's dock.
You can choose to display separators as a line
or a physical hole on the plane.
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