%% 
%%  A DANTE-Edition example
%% 
%%  Example 36-00-31 on page 781.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}

\usepackage{pst-optic}

\begin{document}
\psset{unit=0.8}
\psframebox[fillcolor=black!45,fillstyle=solid]{%
\begin{pspicture*}(-7,-0.5)(7,7)
  \psprismColor[rayColor=white]
\end{pspicture*}}
\end{document}