diff --git a/effects/kaleidoscope.metal b/effects/kaleidoscope.metal
deleted file mode 100644
index 92fb1c0..0000000
--- a/effects/kaleidoscope.metal
+++ /dev/null
@@ -1,13 +0,0 @@
-// Folds the picture into mirrored wedges around the centre.
-// order 90
-// slider segments 2.0 16.0 6.0
-// slider spin -2.0 2.0 0.2
-float4 effect(float2 uv, Inputs in) {
-    float2 shape = float2(in.resolution.x / in.resolution.y, 1.0);
-    float2 c = (uv - 0.5) * shape;
-    float wedge = 6.2832 / floor(in.p.segments);
-    float a = atan2(c.y, c.x) + in.time * in.p.spin;
-    a = abs(a - wedge * floor(a / wedge) - wedge * 0.5) - 1.5708;  // fold into one mirrored wedge, pointing up
-    float2 from = float2(cos(a), sin(a)) * length(c) / shape + 0.5;
-    return float4(in.image.sample(in.smp, from).rgb, 1.0);
-}