diff --git a/basics/OS_evolution.jpg b/basics/OS_evolution.jpg
new file mode 120000
index 0000000000000000000000000000000000000000..421c91790c794f0a2f464f5302093a946131525b
--- /dev/null
+++ b/basics/OS_evolution.jpg
@@ -0,0 +1 @@
+../presentation-pics/pics/OS_evolution.jpg
\ No newline at end of file
diff --git a/basics/OS_placement.svg b/basics/OS_placement.svg
new file mode 120000
index 0000000000000000000000000000000000000000..f0c1650c82b90ff6741f892fc49c120a0e9e9db1
--- /dev/null
+++ b/basics/OS_placement.svg
@@ -0,0 +1 @@
+../presentation-pics/pics/OS_placement.svg
\ No newline at end of file
diff --git a/basics/Windows1.0.png b/basics/Windows1.0.png
deleted file mode 120000
index 2ffe5a717f0119e136583fb251cefa5cae4cbf4c..0000000000000000000000000000000000000000
--- a/basics/Windows1.0.png
+++ /dev/null
@@ -1 +0,0 @@
-../presentation-pics/pics/Windows1.0.png
\ No newline at end of file
diff --git a/basics/Windows1_0.png b/basics/Windows1_0.png
new file mode 120000
index 0000000000000000000000000000000000000000..8dfadf23cae1ad0af052f3db788808dc4b24a905
--- /dev/null
+++ b/basics/Windows1_0.png
@@ -0,0 +1 @@
+../presentation-pics/pics/Windows1_0.png
\ No newline at end of file
diff --git a/basics/basics.tex b/basics/basics.tex
index 0ff19b2f21a2e91730fbb93637123f0de75ce015..cefafcd31166b9d192dd54c69e1916e1bc03ed89 100644
--- a/basics/basics.tex
+++ b/basics/basics.tex
@@ -37,7 +37,7 @@
   \begin{minipage}[t]{0.48\textwidth}
     \begin{figure}
       \begin{center}
-        \includegraphics[height=0.8\textheight]{pics/placement}
+        \includegraphics[height=0.8\textheight]{OS_placement}
       \end{center}
       \caption{Operating systems.}
     \end{figure}
@@ -61,7 +61,7 @@
   \begin{minipage}[t]{0.48\textwidth}
     \begin{figure}[]
       \begin{center}
-        \includegraphics[width=\textwidth]{pics/Mz80k}
+        \includegraphics[width=\textwidth]{Mz80k}
       \end{center}
       \caption{Sharp MZ-80K.}
       \label{}
@@ -71,7 +71,7 @@
   \begin{minipage}[t]{0.48\textwidth}
     \begin{figure}[]
       \begin{center}
-        \includegraphics[width=0.6\textwidth]{pics/Tdkc60cassette}
+        \includegraphics[width=0.6\textwidth]{Tdkc60cassette}
       \end{center}
       \caption{Cassette tape.}
       \label{}
@@ -91,7 +91,7 @@
   \begin{minipage}[t]{0.48\textwidth}
     \begin{figure}[]
       \begin{center}
-        \includegraphics[width=\textwidth]{pics/772px-Amiga500_system}
+        \includegraphics[width=\textwidth]{Amiga500}
       \end{center}
       \caption{Commodore Amiga 500.}
       \label{}
@@ -101,7 +101,7 @@
   \begin{minipage}[t]{0.48\textwidth}
     \begin{figure}[]
       \begin{center}
-        \includegraphics[width=\textwidth]{pics/800px-Floppy_disk_2009_G1}
+        \includegraphics[width=\textwidth]{Floppy_disk}
       \end{center}
       \caption{Floppy disks and diskettes.}
       \label{}
@@ -116,7 +116,7 @@
 
   \begin{figure}[]
     \begin{center}
-      \includegraphics[width=0.8\textwidth]{pics/FreeDOS}
+      \includegraphics[width=0.8\textwidth]{FreeDOS}
     \end{center}
     \caption{FreeDOS.}
     \label{}
@@ -128,7 +128,7 @@
 
   \begin{figure}[]
     \begin{center}
-      \includegraphics[height=0.8\textheight]{pics/evolution}
+      \includegraphics[height=0.8\textheight]{OS_evolution}
     \end{center}
     \caption{The operating system family tree.}
     \label{}
@@ -162,11 +162,11 @@
     \begin{figure}[]
       \begin{center}
         \includegraphics[width=\textwidth, height=0.4\textheight]
-          {pics/Windows1_0}
+          {Windows1_0}
         \medskip
 
         \includegraphics[width=\textwidth, height=0.4\textheight]
-          {pics/Windows_95_Desktop_screenshot}
+          {Windows95}
       \end{center}
       \caption{Older versions.}
       \label{}
@@ -196,7 +196,7 @@
   \begin{minipage}[t]{0.48\textwidth}
     \begin{figure}[]
       \begin{center}
-        \includegraphics[width=\textwidth]{pics/Windows8}
+        \includegraphics[width=\textwidth]{Windows8}
       \end{center}
       \caption{Windows 8.1.}
       \label{}
@@ -221,7 +221,7 @@
     \begin{figure}[]
       \begin{center}
         \includegraphics[width=\textwidth, height=0.4\textheight]
-          {pics/Osx-mavericks-screenshot}
+          {OSX-mavericks}
       \end{center}
       \caption{OS X.}
       \label{}
@@ -245,11 +245,11 @@
     \begin{figure}[]
       \begin{center}
         \includegraphics[width=\textwidth, height=0.4\textheight]
-          {pics/linux_desktop_1}
+          {linux-osxlike}
         \medskip
 
         \includegraphics[width=\textwidth, height=0.4\textheight]
-          {pics/linux_desktop_2}
+          {linux-windowslike}
       \end{center}
       \caption{Different flavours.}
       \label{}
@@ -271,7 +271,7 @@
 
   \begin{figure}[]
     \begin{center}
-      \includegraphics[width=0.8\textwidth]{pics/mac-vs-pc-585x230}
+      \includegraphics[width=0.8\textwidth]{mac-vs-pc}
     \end{center}
     \caption{Mac vs. PC.}
     \label{}
diff --git a/basics/linux-osxlike.jpg b/basics/linux-osxlike.jpg
new file mode 120000
index 0000000000000000000000000000000000000000..9ac40932c4dd7dc422d0fb182acab465bff1c59d
--- /dev/null
+++ b/basics/linux-osxlike.jpg
@@ -0,0 +1 @@
+../presentation-pics/pics/linux-osxlike.jpg
\ No newline at end of file
diff --git a/basics/linux-windowslike.jpg b/basics/linux-windowslike.jpg
new file mode 120000
index 0000000000000000000000000000000000000000..13f8d46375af4344c8ba66ad443ae46b8272ba36
--- /dev/null
+++ b/basics/linux-windowslike.jpg
@@ -0,0 +1 @@
+../presentation-pics/pics/linux-windowslike.jpg
\ No newline at end of file
diff --git a/presentation b/presentation
index fbff0b71681578bcb479b24e8e6d3989d0573cd0..ccb6d1119e26bc1d89ed6b53dfceca1a937a1bd6 160000
--- a/presentation
+++ b/presentation
@@ -1 +1 @@
-Subproject commit fbff0b71681578bcb479b24e8e6d3989d0573cd0
+Subproject commit ccb6d1119e26bc1d89ed6b53dfceca1a937a1bd6
diff --git a/presentation-pics b/presentation-pics
index 3751e43688f34f70c88c1542ea9422ec37c1a814..0287014d5a52be79d711108af63b8dc50ff2aa54 160000
--- a/presentation-pics
+++ b/presentation-pics
@@ -1 +1 @@
-Subproject commit 3751e43688f34f70c88c1542ea9422ec37c1a814
+Subproject commit 0287014d5a52be79d711108af63b8dc50ff2aa54