diff --git a/tikz/class-tree/Makefile b/tikz/class-tree/Makefile
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+++ b/tikz/class-tree/Makefile
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+SOURCE = class-tree
+DELAY = 80
+DENSITY = 300
+WIDTH = 512
+
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux *.data *.gnuplot
+
+gif:
+	pdfcrop $(SOURCE).pdf
+	convert -verbose -delay $(DELAY) -loop 0 -density $(DENSITY) $(SOURCE)-crop.pdf $(SOURCE).gif
+	make clean
+
+png:
+	make
+	make svg
+	inkscape $(SOURCE).svg -w $(WIDTH) --export-png=$(SOURCE).png
+
+transparentGif:
+	convert $(SOURCE).pdf -transparent white result.gif
+	make clean
+
+svg:
+	#inkscape $(SOURCE).pdf --export-plain-svg=$(SOURCE).svg
+	pdf2svg $(SOURCE).pdf $(SOURCE).svg
+	# Necessary, as pdf2svg does not always create valid svgs:
+	inkscape $(SOURCE).svg --export-width=$(WIDTH) --export-plain-svg=$(SOURCE)1.svg
+	rsvg-convert -a -w 720 -f svg $(SOURCE)1.svg -o $(SOURCE).svg
+	rm $(SOURCE)1.svg
diff --git a/tikz/class-tree/README.md b/tikz/class-tree/README.md
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--- /dev/null
+++ b/tikz/class-tree/README.md
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+Compiled example
+----------------
+![Example](class-tree.png)
diff --git a/tikz/class-tree/adult.jpg b/tikz/class-tree/adult.jpg
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diff --git a/tikz/class-tree/bike-sign-french.png b/tikz/class-tree/bike-sign-french.png
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diff --git a/tikz/class-tree/bike-sign-ove.png b/tikz/class-tree/bike-sign-ove.png
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diff --git a/tikz/class-tree/bike-sign.png b/tikz/class-tree/bike-sign.png
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diff --git a/tikz/class-tree/bike.jpg b/tikz/class-tree/bike.jpg
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diff --git a/tikz/class-tree/car.jpg b/tikz/class-tree/car.jpg
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diff --git a/tikz/class-tree/child.jpg b/tikz/class-tree/child.jpg
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diff --git a/tikz/class-tree/class-tree.png b/tikz/class-tree/class-tree.png
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diff --git a/tikz/class-tree/class-tree.tex b/tikz/class-tree/class-tree.tex
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--- /dev/null
+++ b/tikz/class-tree/class-tree.tex
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+\documentclass{article}
+\usepackage[pdftex,active,tightpage]{preview}
+\setlength\PreviewBorder{2mm}
+\usepackage{tikz}
+\usetikzlibrary{patterns,snakes,shapes, calc}
+\usetikzlibrary{decorations.pathreplacing}
+\tikzstyle{clf}=[draw,outer sep=0pt, rounded rectangle, minimum height=0.8cm,
+                 align=center]
+
+\def \leveldist {-1.9}
+
+\begin{document}
+\begin{preview}
+\begin{tikzpicture}
+    \node[clf] (root)   at ( 0, 0) {$C_0$};
+
+    % level 1
+    \node[clf] (ped)    at (-5.0,1*\leveldist) {pedestrian};
+    \node[clf] (wheel4) at (-3.0,1*\leveldist) {four$^+$-\\wheelers};
+    \node[clf] (sign)   at (-1.0,1*\leveldist) {traffic\\sign};
+    \node[clf] (wheel2) at ( 1.0,1*\leveldist) {two-\\wheelers};
+    \node[inner sep=0pt] (street) at (3.0,1*\leveldist) {\includegraphics[height=0.8cm]{road.jpg}};
+    \node[inner sep=0pt] (other) at ( 5.0,1*\leveldist) {\includegraphics[height=0.8cm]{water.jpg}};
+    \draw (root) -- (ped);
+    \draw (root) -- (wheel4);
+    \draw (root) -- (sign);
+    \draw (root) -- (wheel2);
+    \draw (root) -- (other);
+    \draw (root) -- (street);
+
+    % level 2
+    \node[inner sep=0pt] (child) at (-5.3,1.7*\leveldist) {\includegraphics[width=0.5cm]{child.jpg}};
+    \node[inner sep=0pt] (adult) at (-4.6,1.6*\leveldist) {\includegraphics[width=0.5cm]{adult.jpg}};
+    \node[clf] (limit)      at (-2.0,2*\leveldist) {speed\\limit};
+    \node[clf] (danger)     at (-0.5,2*\leveldist) {danger};
+    \node[clf] (other)      at ( 0.8,2*\leveldist) {other};
+    \node[inner sep=0pt] (bike)       at (0.5,1.5*\leveldist) {\includegraphics[height=0.6cm]{bike.jpg}};
+    \node[inner sep=0pt] (motorcycle) at (1.3,1.5*\leveldist) {\includegraphics[height=0.6cm]{motorcycle.jpg}};
+    \node[inner sep=0pt] (car) at (-3.5,1.5*\leveldist) {\includegraphics[height=0.6cm]{car.jpg}};
+    \node[inner sep=0pt] (lkw) at (-2.5,1.5*\leveldist) {\includegraphics[height=0.6cm]{lkw.jpg}};
+    \draw (sign) -- (limit);
+    \draw (sign) -- (danger);
+    \draw (sign) -- (other);
+    \draw (wheel2) -- (bike);
+    \draw (wheel2) -- (motorcycle);
+    \draw (wheel4) -- (car);
+    \draw (wheel4) -- (lkw);
+    \draw (ped) -- (adult);
+    \draw (ped) -- (child);
+
+    % level 3
+    \node[draw=red, text=black, line width=1.5pt, outer sep=1.5pt, circle,inner sep=0pt,minimum height=0.4cm] (speed30)  at (-2.3,2.5*\leveldist) {\tiny 30};
+    \node[draw=red, text=black, line width=1.5pt, outer sep=1.5pt, circle,inner sep=0pt,minimum height=0.4cm] (speed80)  at (-1.7,2.5*\leveldist) {\tiny 80};
+    \node[draw=red, text=black, line width=1.5pt, outer sep=1.5pt, circle,inner sep=0pt,minimum height=0.4cm] (speed120) at (-2.0,2.8*\leveldist) {\tiny 120};
+
+    \node[inner sep=0pt] (dangera) at (-0.8,2.5*\leveldist) {\includegraphics[width=0.5cm]{danger.png}};
+    \node[inner sep=0pt] (dangerb) at (-0.2,2.5*\leveldist) {\includegraphics[width=0.5cm]{danger-right.png}};
+    \node[inner sep=0pt] (dangerc) at (-0.5,2.8*\leveldist) {\includegraphics[width=0.5cm]{slippery.png}};
+
+    \node[inner sep=0pt] (bikea) at (0.5,2.5*\leveldist) {\includegraphics[width=0.5cm]{bike-sign.png}};
+    \node[inner sep=0pt] (bikeb) at (1.1,2.5*\leveldist) {\includegraphics[width=0.5cm]{bike-sign-french.png}};
+    \node[inner sep=0pt] (bikec) at (0.8,2.8*\leveldist) {\includegraphics[width=0.5cm]{bike-sign-ove.png}};
+
+    \draw (limit) -- (speed30);
+    \draw (limit) -- (speed80);
+    \draw (limit) -- (speed120);
+
+    \draw (danger) -- (dangera);
+    \draw (danger) -- (dangerb);
+    \draw (danger) -- (dangerc);
+
+    \draw (other) -- (bikea);
+    \draw (other) -- (bikeb);
+    \draw (other) -- (bikec);
+
+\end{tikzpicture}
+\end{preview}
+\end{document}
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diff --git a/tikz/class-tree/lkw.jpg b/tikz/class-tree/lkw.jpg
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