diff --git a/extra/zigzag01.png b/extra/zigzag01.png
new file mode 100644
index 00000000..88703fb1
Binary files /dev/null and b/extra/zigzag01.png differ
diff --git a/extra/zigzag02.png b/extra/zigzag02.png
new file mode 100644
index 00000000..cd8022c5
Binary files /dev/null and b/extra/zigzag02.png differ
diff --git a/extra/zigzag04.png b/extra/zigzag04.png
new file mode 100644
index 00000000..cb708208
Binary files /dev/null and b/extra/zigzag04.png differ
diff --git a/extra/zigzag08.png b/extra/zigzag08.png
new file mode 100644
index 00000000..b40d437d
Binary files /dev/null and b/extra/zigzag08.png differ
diff --git a/extra/zigzag16.png b/extra/zigzag16.png
new file mode 100644
index 00000000..0dbb84e4
Binary files /dev/null and b/extra/zigzag16.png differ
diff --git a/extra/zigzag32.png b/extra/zigzag32.png
new file mode 100644
index 00000000..6baee0c9
Binary files /dev/null and b/extra/zigzag32.png differ