diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/50.entropy/05.first-steps/textbook.en.fr b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/50.entropy/05.first-steps/textbook.en.fr
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+---
+title: Brainstorming to structure a transverse theme "Entropy"
+published: true
+routable: true
+visible: false
+lessons:
+lessons:
+    - slug: brainstorming-g12-classical-mechanics
+      order: 1
+---
+
+#### Overall brainstorming to structure a transverse theme "Entropy", 
+for all levels.
+
+--------------------
+
+### Foreword
+
+
+This is an *important stage*, because it will be
+the first **tree structure of filesystems** in which we will work.
+
+---------------------
+
+### Brainstorming
+