diff --git a/folds/out/hyperbolic-1.png b/folds/out/hyperbolic-1.png
new file mode 100644
index 0000000..eaedf8b
Binary files /dev/null and b/folds/out/hyperbolic-1.png differ
diff --git a/folds/project.clj b/folds/project.clj
index 73f9095..6e91277 100644
--- a/folds/project.clj
+++ b/folds/project.clj
@@ -4,4 +4,4 @@
   :license {:name "Eclipse Public License"
             :url "http://www.eclipse.org/legal/epl-v10.html"}
   :dependencies [[org.clojure/clojure "1.10.1"]
-                 [quil "3.1.0"]])
+                 [quil "4.0.0-SNAPSHOT"]])
diff --git a/folds/src/folds/core.clj b/folds/src/folds/core.clj
index 76e6bec..7b1dc66 100644
--- a/folds/src/folds/core.clj
+++ b/folds/src/folds/core.clj
@@ -3,21 +3,21 @@
             [quil.middleware :as m]))
 
 (defn settings []
-  (q/smooth 8))
+  (q/smooth))
 
-(def y (atom -3))
-(reset! y 0)
 (def keep-going (atom true))
 (def x1 -3)
 (def y1 -3)
+(def y (atom y1))
 (def x2 3)
 (def y2 3)
 
 (defn setup []
+  (q/background 0 0 0)
   ; Set frame rate to 30 frames per second.
   (q/frame-rate 30)
   ; Set color mode to HSB (HSV) instead of default RGB.
-  (q/color-mode :hsb)
+  ; (q/color-mode :hsb)
   ; circle color and position.
   {:color 0
    :angle 0
@@ -25,44 +25,70 @@
 
 (defn update-state [state]
   ; Update sketch state by changing circle color and position.
-  {:color (mod (+ (:color state) 0.7) 255)
+  {:color (mod (+ (:color state) 10.7) 255)
    :angle (+ (:angle state) 0.1)
    :step (:step state)})
 
-(defn sinusodial [v amount]
-  (println v)
+(def test-vecs
+  [[2.98798 2.6571]
+   [0.00153 0.05489]
+   [-1.548 -2.0157]])
+
+(defn test-func
+  [func]
+  (mapv #(func % x2) test-vecs))
+
+(defn hyperbolic
+  "doesn't handle negative numbers?"
+  [v amount]
+  (let [[x y] v
+        mag (q/sqrt (reduce + (mapv * v)))
+        r (+ mag (q/exp -10))
+        theta (q/atan2 x y)]
+    [(* amount (/ (q/sin theta) r)) (* amount (* (q/cos theta) r))]))
+
+(comment
+  (test-func hyperbolic))
+
+(defn sinusodial
+  [v amount]
   (->> v
        (mapv (partial q/sin))
-       (mapv * [amount amount])))
+       (mapv (partial * amount))))
+
+(comment
+  (test-func sinusodial))
 
 (defn draw-variation
   [v state]
-  (let [[xx yy] (->> v
-                     ; (mapv #(sinusodial % 3))
+  (let [[xx yy] (->> (hyperbolic v x2)
+                     ; #(sinusodial % x2)
+                     (mapv (partial * (q/random-gaussian) 0.003))
                      (mapv #(q/map-range % x1 x2 20 (- (q/width) 20))))]
     (q/point xx yy)))
 
 (defn draw-state
   [state]
-  ; (q/background 0 0 0)
   (let [color (:color state)
         step (:step state)]
     ; Set color.
-    (q/fill color 255 255)
-    (q/stroke color 255 255)
+    (q/fill 255 255 255)
+    (q/stroke color 255 155)
     (q/stroke-weight 0.2)
 
     (if @keep-going
       (do
-        (doseq [x (range x1 x2 step)
-                y (range y1 y2 step)]
-          (draw-variation [x y] state))
-        (reset! keep-going false)))
-    (q/ellipse 50 50 15 15)))
+        (doseq [_ (range 12)]
+          (doseq [x (range x1 x2 step)]
+            (draw-variation [x @y] state))
+          (swap! y + step)
+          (if (> @y y2)
+            (reset! keep-going false)))))))
+    ; (q/ellipse 50 50 15 15)))
 
 (q/defsketch folds
   :title "Folding"
-  :size [500 500]
+  :size [520 520]
   ; setup function called only once, during sketch initialization.
   :setup setup
   ; update-state is called on each iteration before draw-state.