diff --git a/main.go b/main.go
index 3d94523..2203f68 100644
--- a/main.go
+++ b/main.go
@@ -32,7 +32,7 @@ func main() {
 		os.Exit(1)
 	}
 
-	rl.SetConfigFlags(rl.FlagMsaa4xHint)
+	//rl.SetConfigFlags(rl.FlagMsaa4xHint)
 	rl.InitWindow(targetWidth, targetHeight, "sumi sierpinski arrow")
 
 	// layout_name: controls initialization
@@ -64,7 +64,7 @@ func main() {
 
 	//sketch.AddColorLayer("background-black", rl.Black)
 	sketch.AddColorLayer("background-magenta", rl.Magenta)
-	sketch.AddLayer("field", &FieldLayer{field: field, loColor: rl.NewColor(0, 0, 0, 0), hiColor: rl.NewColor(44, 255, 200, 255), dirty: true})
+	sketch.AddLayer("field", &FieldLayer{field: field, loColor: rl.NewColor(0, 0, 0, 0), hiColor: rl.Yellow, dirty: true})
 	contourLayer := NewContourLayer(&sketch, rng, field)
 	sketch.AddLayer("contours", contourLayer)
 	sketch.AddLayer("sierpinski-arrowhead", sierpinskiLayer)
diff --git a/sketch.go b/sketch.go
index a2bb124..8933cef 100644
--- a/sketch.go
+++ b/sketch.go
@@ -128,7 +128,7 @@ func (s *Sketch) Draw(ctx *RenderCtx) {
 	viewport := s.CalcViewport(ctx)
 
 	rl.BeginTextureMode(s.composite)
-	rl.ClearBackground(rl.NewColor(0, 0, 0, 0))
+	rl.ClearBackground(rl.Blank)
 	for _, instance := range s.layerToolsOrdered {
 		config := instance.config
 		if config.visible {