Ohh, and if I understood correctly, what you are going to do, you should
really change the -1 here to -.999 'cause of the coincident surfaces
problem.
box { <4,-1,-9.875>, <7, 4, -10.125> }
goes
box { <4,-.999,-9.875>, <7, 4, -10.125> }
See 9.1.2.5 http://www.povray.org/documentation/view/308/
