diff --git a/contour_layer.go b/contour_layer.go
index 081555f..244c7a1 100644
--- a/contour_layer.go
+++ b/contour_layer.go
@@ -11,10 +11,11 @@ type ContourLayer struct {
 	maxActors uint32
 	actors []*Actor
 	actorIndex uint32
+	actorColor rl.Color
 	rng    *rand.Rand
 }
 
-func NewContourLayer(sketch *Sketch, rng *rand.Rand, field Field) *ContourLayer {
+func NewContourLayer(sketch *Sketch, rng *rand.Rand, field Field, color rl.Color) *ContourLayer {
 
 	maxActors := 200000
 
@@ -25,15 +26,14 @@ func NewContourLayer(sketch *Sketch, rng *rand.Rand, field Field) *ContourLayer
 		field: field,
 		actors: actors,
 		maxActors: uint32(maxActors),
+		actorColor: color,
 		actorIndex: 0,
 	}
 
-	//layer.AddActors(1, sketch.sourceWidth, sketch.sourceHeight)
-
 	return &layer
 }
 
-func (s *ContourLayer) AddActors(n, sourceWidth, sourceHeight int32) {
+func (s *ContourLayer) AddActors(color rl.Color, n, sourceWidth, sourceHeight int32) {
 	for range n {
 		x := s.rng.Int31() % sourceWidth
 		y := s.rng.Int31() % sourceHeight
@@ -42,7 +42,7 @@ func (s *ContourLayer) AddActors(n, sourceWidth, sourceHeight int32) {
 				position: rl.Vector2{X: float32(x), Y: float32(y)},
 				field:    s.field,
 				stepSize: 1,
-				color:    rl.NewColor(11, 35, 176, 50),
+				color:    s.actorColor,
 			}
 		s.actors[s.actorIndex] = newActor
 		s.actorIndex = (s.actorIndex + 1) % s.maxActors
@@ -50,7 +50,7 @@ func (s *ContourLayer) AddActors(n, sourceWidth, sourceHeight int32) {
 }
 
 func (s *ContourLayer) Update(ctx *RenderCtx) {
-	s.AddActors(100, ctx.SourceWidth, ctx.SourceHeight)
+	s.AddActors(s.actorColor, 100, ctx.SourceWidth, ctx.SourceHeight)
 }
 
 func (s *ContourLayer) Draw(ctx *RenderCtx) {
diff --git a/internal/graphics/graphics.go b/internal/graphics/graphics.go
new file mode 100644
index 0000000..d2cae53
--- /dev/null
+++ b/internal/graphics/graphics.go
@@ -0,0 +1,62 @@
+package graphics
+
+import (
+	"math/rand"
+	rl "github.com/gen2brain/raylib-go/raylib"
+)
+
+var (
+	FlourescentHues = []float32{
+		0,   // hot magenta-red
+		30,  // neon orange
+		60,  // acid yellow
+		120, // laser green
+		180, // cyan
+		210, // electric blue
+		270, // ultraviolet purple
+	}
+	FlourescentColors = makeFlourescentColors()
+)
+
+func makeFlourescentColors() []rl.Color {
+	fc := make([]rl.Color, len(FlourescentHues))
+	for i, hue := range(FlourescentHues) {
+		fc[i] = rl.ColorFromHSV(hue, 1.0, 1.0)
+	}
+	return fc
+}
+
+type ColorCycle interface {
+	Next() rl.Color
+}
+
+type ArrayBackedColorCycle struct {
+	colors []rl.Color
+	index int
+}
+
+func NewFixedColorCycle(colors []rl.Color) ArrayBackedColorCycle {
+	return ArrayBackedColorCycle {
+		colors: colors,
+		index: 0,
+	}
+}
+
+func (c ArrayBackedColorCycle) Shuffle(seed int64) ColorCycle {
+	r := rand.New(rand.NewSource(seed))
+	cprime := &ArrayBackedColorCycle {
+		colors: make([]rl.Color, len(c.colors)),
+		index: 0,
+	}
+	r.Shuffle(len(c.colors), func(i, j int) {
+		cprime.colors[i] = c.colors[j]
+	})
+	return cprime
+}
+
+func (c *ArrayBackedColorCycle) Next() rl.Color {
+	color := c.colors[c.index]
+	c.index = (c.index + 1) % len(c.colors)
+	return color
+}
+
diff --git a/main.go b/main.go
index bb430be..d8f3109 100644
--- a/main.go
+++ b/main.go
@@ -1,13 +1,15 @@
 package main
 
 import (
-	//	"fmt"
+	"fmt"
 	"log"
 	"math/rand"
 	"os"
 	"time"
 	"flag"
 
+	g "github.com/d2fn/sumi/internal/graphics"
+
 	gui "github.com/gen2brain/raylib-go/raygui"
 	rl "github.com/gen2brain/raylib-go/raylib"
 	//"github.com/ojrac/opensimplex-go"
@@ -46,12 +48,16 @@ func main() {
 
 	BlendModeToggleGroupActive := int32(0)
 
+	// reproducable flourescent color cycle
+	colorCycle := g.NewFixedColorCycle(g.FlourescentColors)//.Shuffle(0)
+
 	rl.SetTargetFPS(60)
 	t0 := time.Now()
 
 	rng := rand.New(rand.NewSource(0))
-	//imageField := NewImageField("/home/d/Dropbox/art/data/david.png")
-	imageField := NewImageField("/home/d/Dropbox/art/data/bassrockastro/Photo Dec 24 2025, 5 58 23 PM.jpg")
+	imageField := NewImageField("/home/d/Dropbox/art/data/david.png")
+	//imageField := NewImageField("/home/d/Dropbox/art/data/bassrockastro/Photo Dec 24 2025, 5 58 23 PM.jpg")
+	//imageField := NewImageField("/home/d/Dropbox/art/data/bassrockastro/andromeda.jpg")
 	//imageField := NewImageField("/home/d/Dropbox/art/data/moses_statue.jpg")
 	field :=
 		&TranslateField {
@@ -66,11 +72,24 @@ func main() {
 
 	sketch := NewSketch(sourceWidth, sourceHeight)
 
+	fieldColor := colorCycle.Next()
+	fmt.Printf("field color = %v\n", fieldColor)
+
 
 	sketch.AddColorLayer("background-magenta", rl.Magenta)
 	sketch.AddColorLayer("background-black", rl.Black)
-	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("field", &FieldLayer{field: field, loColor: rl.NewColor(0, 0, 0, 0), hiColor: fieldColor, dirty: true})
+	actorColor := colorCycle.Next()
+
+	fmt.Printf("actor color = %v\n", actorColor)
+
+	hsv := rl.ColorToHSV(actorColor);
+	hsv.Z *= 0.7
+	actorColor = rl.ColorFromHSV(hsv.X, hsv.Y, hsv.Z)
+	actorColor.A = 50
+	//NewColor(11, 35, 176, 50),
+	//r
+	contourLayer := NewContourLayer(&sketch, rng, field, actorColor)
 	sketch.AddLayer("contours", contourLayer)
 	sketch.AddLayer("sierpinski-arrowhead", sierpinskiLayer)
 //	aurora := NewImageLayer("/home/d/Dropbox/photos/Events/2025/Aurora/Photo Nov 11 2025, 9 52 03 PM.jpg")