diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/10.mathematical-tools/20.reference-frames-coordinate-systems/.gitkeep b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/10.mathematical-tools/20.reference-frames-coordinate-systems/.gitkeep deleted file mode 100644 index e69de29bb..000000000