\documentclass[]{article}
\usepackage{pstricks}
\usepackage{pst-vue3d}
\pagestyle{empty}
\parindent=0pt

\xdefinecolor{marron}{rgb}{1,0.55,0}
\def\Sol{%
    \psset{normaleLongitude=90,normaleLatitude=90}
    \FrameThreeD[fillcolor=lightgray,fillstyle=solid](0,0,-2)(2,-2)(-2,2)
    \QuadrillageThreeD[grille=.5,linecolor=red](0,0,-2)(-2,-2)(2,2)%
    \QuadrillageThreeD[grille=0.75,linecolor=cyan](0,0,-2)(-2,-2)(2,2)%
}
\def\chaise{%
  \FrameThreeD[normaleLatitude=0,normaleLongitude=0,%
     fillcolor=marron,fillstyle=solid](-0.8,1,2)(0.2,0)(1.8,1)
  \CubeThreeD[A=.1,B=0.1,C=0.9](0.9,-0.9,-1.1)
  \CubeThreeD[A=.1,B=0.1,C=0.9](0.9,0.9,-1.1)
  \CubeThreeD[A=.1,B=0.1,C=2](-0.9,0.9,0)
  \CubeThreeD[A=.1,B=0.1,C=2](-0.9,-0.9,0)
  \CubeThreeD[A=0.9,B=1,C=0.1](0.1,0,-0.1)
}
\begin{document}


\begin{center}
\bgroup
\begin{pspicture}(-4,-5.5)(3.5,3.5)
	\setkeys{psset}{THETA=30,PHI=20,Dobs=10,Decran=15}
	\Sol\chaise
	\pNodeThreeD(-0.5,-0.3,0){littleChair}
	\rput[lC](littleChair){%
	    \setkeys{psset}{THETA=30,PHI=20,Dobs=100,Decran=20}
		\Sol\chaise%
	}
\end{pspicture}
\egroup
\end{center}

\end{document}

