
BPB (Baseplate Plus Brick) is a technique for raising, slightly, the
ground level of your landscape. There are several advantages to
this, mainly that lakes, rivers and streams can be placed lower than
ground level for a much more natural look. It also opens up more
opportunities for the use of bricks and plates that you otherwise might
not be able to use in a flat landscape, since the basic ground level
height is roughly one brick high (see here
for example). All Base8 modules can be built without BPB, but
there will be a noticeable discrepancy between baseplates. BPB
can be achieved either by getting a hold of some 9.6mm (or roughly 3/8ths of an inch) thick material
such as cardboard, foam-core or plywood and placing your baseplates on
it, or you can build BPB supports. There are many ways to achieve this,
see the following pictures for examples.

Displays built without BPB tend to have more noticeable discrepancies between baseplates.
WAMALUG used BPB in October 2005 to recess the roads in their Fall for Fairfax castle display.