diff --git a/povray/ellipsoid/glass.inc b/povray/ellipsoid/glass.inc
index 2f4cef6..a292008 100644
--- a/povray/ellipsoid/glass.inc
+++ b/povray/ellipsoid/glass.inc
@@ -16,8 +16,8 @@ material {
   }
   interior {
     ior 1.5 // Glass refraction
-    fade_power 1001
+    fade_power 1000
     fade_distance 0.9
-    fade_color <0.5,0.8,0.6>
+    fade_color <0.1,0.1,0.9>
   }
 }
diff --git a/tikz/rectangle/Makefile b/tikz/rectangle/Makefile
new file mode 100644
index 0000000..b1f77de
--- /dev/null
+++ b/tikz/rectangle/Makefile
@@ -0,0 +1,31 @@
+SOURCE = rectangle-3
+DELAY = 80
+DENSITY = 300
+WIDTH = 512
+
+make:
+	pdflatex $(SOURCE).tex -output-format=pdf
+	make clean
+
+clean:
+	rm -rf  $(TARGET) *.class *.html *.log *.aux
+
+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 $(SOURCE).svg --export-plain-svg=$(SOURCE).svg
diff --git a/tikz/rectangle/rectangle-1.tex b/tikz/rectangle/rectangle-1.tex
new file mode 100644
index 0000000..d1b59bb
--- /dev/null
+++ b/tikz/rectangle/rectangle-1.tex
@@ -0,0 +1,30 @@
+\documentclass{article}
+\usepackage{gensymb}
+\usepackage[pdftex,active,tightpage]{preview}
+\setlength\PreviewBorder{2mm}
+\usepackage{tikz}
+\usetikzlibrary{arrows,positioning,decorations.pathreplacing,shapes} 
+\tikzset{
+    %Define standard arrow tip
+    >=stealth',
+    % Define arrow style
+    pil/.style={
+           ->,
+           thick}
+}
+
+\begin{document}
+\begin{preview}
+  \begin{tikzpicture}
+    \draw[color=orange, very thick, fill=orange!20] (-3.5,-0.5) -- (-2.5,2.5) -- (2.5,1)  -- (1.5,-2) -- cycle;
+    \draw [<->, thick, red] (0,3.0) -- (0,0) -- (3,0);
+    \draw[fill, color=purple] (-2,1) circle [radius=0.04];
+    \node [below right, purple] at (-2,1) {$(x|y)$};
+    \node [below left, orange] at (-3.5,-0.5) {A};
+    \node [above, orange] at (-2.5,2.5) {B};
+    \node [right, orange] at (2.5,1) {C};
+    \node [below, orange] at (1.5,-2) {D};
+    \draw[step=0.5cm,color=gray] (-4.0, -2.5) grid (3.0,3.0);
+  \end{tikzpicture}
+\end{preview}
+\end{document}
diff --git a/tikz/rectangle/rectangle-2.tex b/tikz/rectangle/rectangle-2.tex
new file mode 100644
index 0000000..67fff20
--- /dev/null
+++ b/tikz/rectangle/rectangle-2.tex
@@ -0,0 +1,33 @@
+\documentclass{article}
+\usepackage{gensymb}
+\usepackage[pdftex,active,tightpage]{preview}
+\setlength\PreviewBorder{2mm}
+\usepackage{tikz}
+\usetikzlibrary{arrows,positioning,decorations.pathreplacing,shapes} 
+\tikzset{
+    %Define standard arrow tip
+    >=stealth',
+    % Define arrow style
+    pil/.style={
+           ->,
+           thick}
+}
+
+\begin{document}
+\begin{preview}
+  \begin{tikzpicture}
+    \draw[color=orange, very thick, fill=orange!20] (-3.5,-0.5) -- (-2.5,2.5) -- (2.5,1)  -- (1.5,-2) -- cycle;
+    \draw[color=gray, very thick, fill=gray!20] (-3.5,-0.5) -- (-2.5,2.5) -- (-2,1) -- cycle;
+    \draw[color=green, very thick, fill=green!20] (-2.5,2.5) -- (2.5,1) -- (-2,1) -- cycle;
+    \draw[color=blue, very thick, fill=blue!20] (2.5,1)  -- (1.5,-2) -- (-2,1) -- cycle;
+    \draw[color=purple, very thick, fill=purple!20] (1.5,-2)  -- (-3.5,-0.5) -- (-2,1) -- cycle;
+    \draw [<->, thick, red] (0,3.0) -- (0,0) -- (3,0);
+    \draw[fill, color=purple] (-2,1) circle [radius=0.04];
+    \node [below left, orange] at (-3.5,-0.5) {A};
+    \node [above, orange] at (-2.5,2.5) {B};
+    \node [right, orange] at (2.5,1) {C};
+    \node [below, orange] at (1.5,-2) {D};
+    \draw[step=0.5cm,color=gray] (-4.0, -2.5) grid (3.0,3.0);
+  \end{tikzpicture}
+\end{preview}
+\end{document}
diff --git a/tikz/rectangle/rectangle-3.tex b/tikz/rectangle/rectangle-3.tex
new file mode 100644
index 0000000..e8773ef
--- /dev/null
+++ b/tikz/rectangle/rectangle-3.tex
@@ -0,0 +1,33 @@
+\documentclass{article}
+\usepackage{gensymb}
+\usepackage[pdftex,active,tightpage]{preview}
+\setlength\PreviewBorder{2mm}
+\usepackage{tikz}
+\usetikzlibrary{arrows,positioning,decorations.pathreplacing,shapes} 
+\tikzset{
+    %Define standard arrow tip
+    >=stealth',
+    % Define arrow style
+    pil/.style={
+           ->,
+           thick}
+}
+
+\begin{document}
+\begin{preview}
+  \begin{tikzpicture}
+    \draw[color=orange, very thick, fill=orange!20] (-3.5,-0.5) -- (-2.5,2.5) -- (2.5,1)  -- (1.5,-2) -- cycle;
+    \draw[color=gray, very thick] (-3.5,-0.5) -- (-2.5,2.5) -- (2,2.5) -- cycle;
+    \draw[color=green, very thick] (-2.5,2.5) -- (2.5,1) -- (2,2.5) -- cycle;
+    \draw[color=blue, very thick] (2.5,1)  -- (1.5,-2) -- (2,2.5) -- cycle;
+    \draw[color=purple, very thick] (1.5,-2)  -- (-3.5,-0.5) -- (2,2.5) -- cycle;
+    \draw [<->, thick, red] (0,3.0) -- (0,0) -- (3,0);
+    \draw[fill, color=purple] (2,2.5) circle [radius=0.04];
+    \node [below left, orange] at (-3.5,-0.5) {A};
+    \node [above, orange] at (-2.5,2.5) {B};
+    \node [right, orange] at (2.5,1) {C};
+    \node [below, orange] at (1.5,-2) {D};
+    \draw[step=0.5cm,color=gray] (-4.0, -2.5) grid (3.0,3.0);
+  \end{tikzpicture}
+\end{preview}
+\end{document}