diff --git a/scene-graph.scg b/scene-graph.scg
index 1600a87..7c06a40 100644
--- a/scene-graph.scg
+++ b/scene-graph.scg
@@ -55,7 +55,7 @@ shininess 100
 obj 0
 use 1
 name myChair1_1
-rotateY 1.570796
+rotateY -1.570796
 
 # Platz 2 #
 obj 1
@@ -1037,9 +1037,9 @@ obj 147
 name myChalkboard
 scale 1.9 1.9 1.9
 rotateX 0.0
-rotateY 4.712388
+rotateY 1.570796
 rotateZ 0.0
-translate 0.0 -0.6 -6.4
+translate 0.0 -0.6 6.4
 
 # Chalkboard 1 #
 obj 138