diff --git a/examples/wavy.glsl b/examples/wavy.glsl
index b8d05f2..c1d1afb 100644
--- a/examples/wavy.glsl
+++ b/examples/wavy.glsl
@@ -1,3 +1,5 @@
+#define PI 3.1415926538
+
 void mainImage(out vec4 fragColor, in vec2 fragCoord) {
     vec2 uv = fragCoord / iResolution;
 
@@ -9,7 +11,13 @@ void mainImage(out vec4 fragColor, in vec2 fragCoord) {
     float distance = distance(uv, vec2(0.5, 0.5));
     float inverse_distance = 1.0 - distance;
     lines_uv += (lines_uv - vec2(0.5, 0.5)) * inverse_distance * 3.0;
-
+    float rot = PI * 0.2;
+    mat2x2 rotm = mat2x2(
+        cos(rot), -sin(rot),
+        sin(rot), cos(rot)
+    );
+    lines_uv *= rotm;
+    //mat2x2 x = mat2x2(1.0, 1.0, 1.0, 1.0);
     // The lines themselves
     float lines_timescale = iTime * 0.6;
     lines_uv.x += sin(lines_timescale + lines_uv.y * 30.0) * 0.2;// * sin(lines_timescale);