diff --git a/notebooks/pics/pile_triangle.png b/notebooks/pics/pile_triangle.png
new file mode 100644
index 0000000000000000000000000000000000000000..6bd39296331b799657e9b0fde75448d9404f1e30
Binary files /dev/null and b/notebooks/pics/pile_triangle.png differ
diff --git a/notebooks/pics/repeat_triangle.png b/notebooks/pics/repeat_triangle.png
new file mode 100644
index 0000000000000000000000000000000000000000..41f25b8af43187b96b1334e040c863b13ac6c73d
Binary files /dev/null and b/notebooks/pics/repeat_triangle.png differ
diff --git a/notebooks/pics/tiled_triangle.png b/notebooks/pics/tiled_triangle.png
new file mode 100644
index 0000000000000000000000000000000000000000..4f4901630007c8440e01eb15f6da36a1b965bc88
Binary files /dev/null and b/notebooks/pics/tiled_triangle.png differ