diff --git a/doc/layers.png b/doc/layers.png
index 639cf294..2f7c3757 100644
Binary files a/doc/layers.png and b/doc/layers.png differ
diff --git a/doc/layers.svg b/doc/layers.svg
index 003a32df..7d736e12 100644
--- a/doc/layers.svg
+++ b/doc/layers.svg
@@ -31,6 +31,13 @@
inkscape:vp_y="0 : 1000 : 0"
inkscape:vp_x="0 : 0.5 : 1"
sodipodi:type="inkscape:persp3d" />
+
Envirotiles
-
-
-
-
-
-
-
-
-
-
-
+
+
+
+
+
+
+
-
-
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+
@@ -884,25 +872,18 @@
id="path4356"
d="m 38.95436,153.73434 c 0.368649,3.56313 -0.04727,-0.83367 0.118038,1.97537 0.0089,0.15042 0.06194,0.29567 0.07503,0.44577 0.04726,0.54217 -0.113244,0.31463 0.109854,0.55758 0,0 -0.301358,0.19167 -0.301358,0.19167 l 0,0 c -0.274133,-0.51829 -0.108238,-0.0868 -0.160987,-0.69179 -0.01475,-0.16922 -0.0695,-0.33376 -0.07968,-0.50333 -0.172031,-2.86585 0.270139,1.80899 -0.113387,-1.91781 0,0 0.35249,-0.0575 0.35249,-0.0575 z" />
-
-
-
-
-
-
+
+
+
z = 2.50
+ y="470.69196">z = 1.50
z = 3.50
+ sodipodi:role="line">z = 2.50
(next enviro layer has z = 0.02, 1.02, 2.02...)
+
+
+
+
+
+