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+%This command draw either the escher knot (the original image)
+%or the escher impossible brick (the new one).
+%
+%The Macro use the global (to the page 10) toggle "OriginalImage"
+%
+%The macro has one parameter:
+% 1) The size to use to typeset the content
+\newcommand\TTenDisplayImage[1]{%
+ \parbox[t]{#1}{%
+ \iftoggle{OriginalImage}{%
+ \vfill
+ \iftoggle{DVIOutput}{%
+ \centerline{\includegraphics[viewport=0 0 135 125]{escher.ps}}%
+ }{%
+ \centerline{\includegraphics[viewport=0 0 135 125]{escher.pdf}}%
+ }%
+ }{%
+ % Author: Julien Cretel
+ % Date: 24/02/2013
+ %
+ %The code was published here:
+ %http://www.texample.net/tikz/examples/escher-brick-penrose-triangle/
+ %
+ \savebox\ImpossibleBrick{%
+ \begin{tikzpicture}[scale=4, line join=bevel]
+
+ % \a and \b are two macros defining characteristic
+ % dimensions of the impossible brick.
+ \pgfmathsetmacro{\a}{0.18}
+ \pgfmathsetmacro{\b}{1.37}
+
+ \tikzset{%
+ apply style/.code={\tikzset{##1}},
+ brick_edges/.style={thick,draw=black},
+ face_colourA/.style={fill=gray!50},
+ face_colourB/.style={fill=gray!25},
+ face_colourC/.style={fill=gray!90},
+ }
+
+ \foreach \theta/\v/\facestyleone/\facestyletwo in {%
+ 0/0/{brick_edges,face_colourA}/{brick_edges,face_colourC},
+ 180/-\a/{brick_edges,face_colourB}/{brick_edges,face_colourC}
+ }{
+ \begin{scope}[rotate=\theta,shift={(\v,0)}]
+ \draw[apply style/.expand once=\facestyleone]
+ ({-.5*\b},{1.5*\a}) --
+ ++(\b,0) --
+ ++(-\a,-\a) --
+ ++({-\b+2*\a},0) --
+ ++(0,-{2*\a}) --
+ ++(\b,0) --
+ ++(-\a,-\a) --
+ ++(-\b,0) --
+ cycle;
+ \draw[apply style/.expand once=\facestyletwo]
+ ({.5*\b},{1.5*\a}) --
+ ++(0,{-2*\a}) --
+ ++(-\a,0) --
+ ++(0,\a) --
+ cycle;
+ \end{scope}
+ }
+ \end{tikzpicture}}
+ \par
+ \centerline{\usebox\ImpossibleBrick}
+ }
+ }
+}