diff --git a/project.clj b/project.clj
index 1659659..1254414 100644
--- a/project.clj
+++ b/project.clj
@@ -4,7 +4,8 @@
   :license {:name "EPL-2.0 OR GPL-2.0-or-later WITH Classpath-exception-2.0"
             :url "https://www.eclipse.org/legal/epl-2.0/"}
   :dependencies [[org.clojure/clojure "1.11.1"]
-                 [seesaw "1.5.0"]]
+                 [seesaw "1.5.0"]
+                 [com.formdev/flatlaf "3.2.5"]]
   :main ^:skip-aot age-of-sail.core
   :target-path "target/%s"
   :profiles {:uberjar {:aot :all
diff --git a/src/age_of_sail/core.clj b/src/age_of_sail/core.clj
index 79896ac..52b5bb9 100644
--- a/src/age_of_sail/core.clj
+++ b/src/age_of_sail/core.clj
@@ -1,17 +1,12 @@
 (ns age-of-sail.core
-  (:require [age-of-sail.vec2 :refer :all]
+  (:require [age-of-sail.simulation :refer :all]
+            [age-of-sail.vec2 :refer :all]
             [seesaw.core :refer :all]
-            [seesaw.bind :as b]
-            [clojure.math :as math]))
+            [seesaw.bind :as b])
+  (:import com.formdev.flatlaf.FlatDarculaLaf))
 
-(def tickrate 100)
 (def hardcoded-wind [0.1 3.0]) ;; A strong easternly wind!
 (defonce ships (atom []))
-(def hooks (atom '()))
-(defn subscribe!
-  "Adds a hook to the hooks"
-  [f]
-  (swap! hooks conj f))
 
 (defn ship-names
   "Gets the names from a list of ships"
@@ -56,33 +51,8 @@
 
 (subscribe! #(tick @ships))
 
-;; Simulation controls
-(defonce program (atom :stopped))
-(defn game-loop
-  []
-  (while (#{:running :paused} @program)
-    (when (= :running @program)
-      (doseq [hook @hooks]
-        (hook)))
-    (Thread/sleep (quot 1000 tickrate)))
-  (when-not (compare-and-set! program :killed :stopped)
-    (throw "Error: tried to stop a program that wasn't killed!")))
-
-(defn pause-program
-  []
-  (compare-and-set! program :running :paused))
-
-(defn kill-program
-  []
-  (compare-and-set! program :running :paused)
-  (compare-and-set! program :paused :killed))
-
-(defn start-program
-  []
-  (when (= (first (reset-vals! program :running)) :stopped)
-    (.start (Thread. game-loop))))
-
 ;; UI
+(FlatDarculaLaf/setup)
 (defn ignore-args
   [f]
   (fn [& _] (f)))
@@ -100,17 +70,17 @@
   []
   (let [start-button (button :text "Start" :listen [:mouse-clicked (ignore-args start-program)])
         pause-button (button :text "Pause" :listen [:mouse-clicked (ignore-args pause-program)])
-        kill-button (button :text "Kill" :listen [:mouse-clicked (ignore-args kill-program)])]
+        kill-button  (button :text "Kill"  :listen [:mouse-clicked (ignore-args kill-program)])]
     (letfn [(start-enabled? [state] (contains? #{:stopped :paused} state))
             (pause-enabled? [state] (= :running state))
-            (kill-enabled? [state] (contains? #{:running :paused} state))]
+            (kill-enabled?  [state] (contains? #{:running :paused} state))]
       (b/bind program (b/tee
                        (b/bind (b/transform start-enabled?) (b/property start-button :enabled?))
                        (b/bind (b/transform pause-enabled?) (b/property pause-button :enabled?))
-                       (b/bind (b/transform kill-enabled?) (b/property kill-button :enabled?))))
+                       (b/bind (b/transform kill-enabled?)  (b/property kill-button :enabled?))))
       (config! start-button :enabled? (start-enabled? @program))
       (config! pause-button :enabled? (pause-enabled? @program))
-      (config! kill-button :enabled? (kill-enabled? @program))
+      (config! kill-button  :enabled? (kill-enabled? @program))
       (horizontal-panel :items [start-button pause-button kill-button]))))
 
 (defn ship-chooser
diff --git a/src/age_of_sail/simulation.clj b/src/age_of_sail/simulation.clj
new file mode 100644
index 0000000..eadba79
--- /dev/null
+++ b/src/age_of_sail/simulation.clj
@@ -0,0 +1,34 @@
+(ns age-of-sail.simulation)
+
+(def tickrate 100)
+(def hooks (atom '()))
+(defn subscribe!
+  "Adds a hook to the hooks"
+  [f]
+  (swap! hooks conj f))
+
+(defonce program (atom :stopped))
+
+(defn game-loop
+  []
+  (while (#{:running :paused} @program)
+    (when (= :running @program)
+      (doseq [hook @hooks]
+        (hook)))
+    (Thread/sleep (quot 1000 tickrate)))
+  (when-not (compare-and-set! program :killed :stopped)
+    (throw "Error: tried to stop a program that wasn't killed!")))
+
+(defn pause-program
+  []
+  (compare-and-set! program :running :paused))
+
+(defn kill-program
+  []
+  (compare-and-set! program :running :paused)
+  (compare-and-set! program :paused :killed))
+
+(defn start-program
+  []
+  (when (= (first (reset-vals! program :running)) :stopped)
+    (.start (Thread. game-loop))))