diff --git a/python/csg.py b/python/csg.py
index 1e58f1bb..dff88d9b 100644
--- a/python/csg.py
+++ b/python/csg.py
@@ -29,5 +29,12 @@ CSGeometry.GenerateMesh = csg_meshing_func
 
 
 unit_cube = CSGeometry()
-unit_cube.Add (OrthoBrick(Pnt(0,0,0), Pnt(1,1,1)))
+p1 = Plane(Pnt(0,0,0),Vec(-1,0,0)).bc("back")
+p2 = Plane(Pnt(1,1,1),Vec(1,0,0)).bc("front")
+p3 = Plane(Pnt(0,0,0),Vec(0,-1,0)).bc("left")
+p4 = Plane(Pnt(1,1,1),Vec(0,1,0)).bc("right")
+p5 = Plane(Pnt(0,0,0),Vec(0,0,-1)).bc("bottom")
+p6 = Plane(Pnt(1,1,1),Vec(0,0,1)).bc("top")
+unit_cube.Add (p1*p2*p3*p4*p5*p6)
+# unit_cube.Add (OrthoBrick(Pnt(0,0,0), Pnt(1,1,1)))