a form of decoration in which the design is only slightly raised from the surface.
The process of cutting metal with a tool that varies it's depth of cut to generate a 3D surface. Except for the Pledge & Aldworth CAD/CAM system which is unique, the surface is always reproduced mechanically from a master pattern on a cylinder or disk.
Scenery close to the back edge of a model railway that has been modelled to a reduced depth to give the illusion that the scenery extends much further than it actually does.