diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,54 @@
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+# directories
+build/**
+include/**
+bin/**
+lib/**
+**/**notnow
+# all possible time folders
+**/[0-9]
+**/[0-9][0-9]
+**/[0-9][0-9][0-9]
+**/[0-9][0-9][0-9][0-9]
+**/[0-9][0-9][0-9][0-9][0-9]
+**/[0-9]*.[0-9]
+**/[0-9]*.[0-9][0-9]
+**/[0-9]*.[0-9][0-9][0-9]
+**/[0-9]*.[0-9][0-9][0-9][0-9]
+**/[0-9]*.[0-9][0-9][0-9][0-9][0-9]
+**/[0-9]*.[0-9][0-9][0-9][0-9][0-9][0-9]
+**/[0-9]*.[0-9][0-9][0-9][0-9][0-9][0-9][0-9]
+**/[0-9]*.[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]
+**/VTK
diff --git a/media/rotating-drum-s.png b/media/rotating-drum-s.png
new file mode 100644
index 00000000..2c261a7a
Binary files /dev/null and b/media/rotating-drum-s.png differ