diff --git a/src/engine.rs b/src/engine.rs
index bb1f2d5..8e529d8 100644
--- a/src/engine.rs
+++ b/src/engine.rs
@@ -144,7 +144,7 @@ impl Game {
         })
     }
 
-    pub fn run(mut self) {
+    pub fn run<F: Fn(&mut Context) -> ()>(mut self, f: F) {
         'running: loop {
             for event in self.event_pump.poll_iter() {
                 match event {
@@ -156,6 +156,9 @@ impl Game {
                     _ => {}
                 }
             }
+            self.canvas.set_draw_color(Color::RGB(60, 180, 180));
+            self.canvas.clear();
+            f(&mut self.context());
             self.canvas.present();
         }
         self.canvas.present();
diff --git a/src/main.rs b/src/main.rs
index 3c6f0a5..c2c5922 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -12,7 +12,7 @@ impl<'a> Component for Player<'a> {}
 struct PlayerRenderer;
 
 impl System for PlayerRenderer {
-    fn on_add(&self, ctx: &mut engine::Context) {}
+    fn on_add(&self, _ctx: &mut engine::Context) {}
 
     fn on_update(&self, _ctx: &mut engine::Context) {}
 }
@@ -24,10 +24,10 @@ fn main() {
         let mut context = game.context();
         context.add_system(Box::new(PlayerRenderer));
         context.spawn(vec![Box::new(Player { sprite: None })]);
-
-        let sprite = context.load_sprite("textures/player.png").unwrap();
-        context.draw_sprite(&sprite, 16, 16).unwrap();
     }
 
-    game.run();
+    game.run(|context| {
+        let sprite = context.load_sprite("textures/player.png").unwrap();
+        context.draw_sprite(&sprite, 16, 16).unwrap();
+    });
 }