diff --git a/slides/figs/cas1a_droite.png b/slides/figs/cas1a_droite.png
new file mode 100644
index 0000000000000000000000000000000000000000..9b7b92157e5fe1fa53b7f0e20ecc87f97571caff
Binary files /dev/null and b/slides/figs/cas1a_droite.png differ
diff --git a/slides/figs/cas1a_gauche.png b/slides/figs/cas1a_gauche.png
new file mode 100644
index 0000000000000000000000000000000000000000..c325d8b25cb13e568f24213131d8d77511a9e1ab
Binary files /dev/null and b/slides/figs/cas1a_gauche.png differ
diff --git a/slides/figs/cas1b_droite.png b/slides/figs/cas1b_droite.png
new file mode 100644
index 0000000000000000000000000000000000000000..34344efd9b740261e00c43b30a4c6f9890b74e7b
Binary files /dev/null and b/slides/figs/cas1b_droite.png differ
diff --git a/slides/figs/cas1b_gauche.png b/slides/figs/cas1b_gauche.png
new file mode 100644
index 0000000000000000000000000000000000000000..050eceea5d8a28b24d7c2684ccb4f0f5a0b10cd8
Binary files /dev/null and b/slides/figs/cas1b_gauche.png differ
diff --git a/slides/figs/cas2a_droite.png b/slides/figs/cas2a_droite.png
new file mode 100644
index 0000000000000000000000000000000000000000..f04fb57308b3aecca93f553005a0b611a158ebca
Binary files /dev/null and b/slides/figs/cas2a_droite.png differ
diff --git a/slides/figs/cas2a_gauche.png b/slides/figs/cas2a_gauche.png
new file mode 100644
index 0000000000000000000000000000000000000000..3ef07573f717b27cc49e97209bb34811c16a5319
Binary files /dev/null and b/slides/figs/cas2a_gauche.png differ
diff --git a/slides/figs/cas2b_droite.png b/slides/figs/cas2b_droite.png
new file mode 100644
index 0000000000000000000000000000000000000000..f61d56e332600f56aade1584dc579dd1708e1791
Binary files /dev/null and b/slides/figs/cas2b_droite.png differ
diff --git a/slides/figs/cas2b_gauche.png b/slides/figs/cas2b_gauche.png
new file mode 100644
index 0000000000000000000000000000000000000000..96474155d1814f0f945f1dfe19cf9bb6508ef148
Binary files /dev/null and b/slides/figs/cas2b_gauche.png differ
diff --git a/slides/figs/double_rotation_gauche_droite.png b/slides/figs/double_rotation_gauche_droite.png
new file mode 100644
index 0000000000000000000000000000000000000000..d0e8cc8a1321c354d2adecb57a4e34bc5b98e5d2
Binary files /dev/null and b/slides/figs/double_rotation_gauche_droite.png differ
diff --git a/slides/figs/facteur_equilibre.png b/slides/figs/facteur_equilibre.png
new file mode 100644
index 0000000000000000000000000000000000000000..df60e129ff990ed2ae13647d5e1ca56ae739a9ef
Binary files /dev/null and b/slides/figs/facteur_equilibre.png differ
diff --git a/slides/figs/rotation_gauche_droite.png b/slides/figs/rotation_gauche_droite.png
new file mode 100644
index 0000000000000000000000000000000000000000..28f7476188fc858ecd5fc37b32b933b2956f9d27
Binary files /dev/null and b/slides/figs/rotation_gauche_droite.png differ