diff --git a/app/src/main/java/com/annimon/hotarufx/bundles/Bundle.java b/app/src/main/java/com/annimon/hotarufx/bundles/Bundle.java
new file mode 100644
index 0000000..be5f5da
--- /dev/null
+++ b/app/src/main/java/com/annimon/hotarufx/bundles/Bundle.java
@@ -0,0 +1,8 @@
+package com.annimon.hotarufx.bundles;
+
+import com.annimon.hotarufx.lib.Context;
+
+public interface Bundle {
+
+    void load(Context context);
+}
diff --git a/app/src/main/java/com/annimon/hotarufx/bundles/BundleLoader.java b/app/src/main/java/com/annimon/hotarufx/bundles/BundleLoader.java
new file mode 100644
index 0000000..ed0d9f4
--- /dev/null
+++ b/app/src/main/java/com/annimon/hotarufx/bundles/BundleLoader.java
@@ -0,0 +1,26 @@
+package com.annimon.hotarufx.bundles;
+
+import com.annimon.hotarufx.lib.Context;
+import java.util.Collections;
+import java.util.List;
+import lombok.val;
+
+public final class BundleLoader {
+
+    public static void loadSingle(Context context, Class<? extends Bundle> clazz) {
+        load(context, Collections.singletonList(clazz));
+    }
+
+    public static void load(Context context, List<Class<? extends Bundle>> bundles) {
+        if (bundles == null || bundles.isEmpty()) {
+            return;
+        }
+
+        for (Class<? extends Bundle> clazz : bundles) {
+            try {
+                val bundle = clazz.newInstance();
+                bundle.load(context);
+            } catch (IllegalAccessException | InstantiationException ignore) {}
+        }
+    }
+}
diff --git a/app/src/main/java/com/annimon/hotarufx/bundles/CompositionBundle.java b/app/src/main/java/com/annimon/hotarufx/bundles/CompositionBundle.java
new file mode 100644
index 0000000..cd28c89
--- /dev/null
+++ b/app/src/main/java/com/annimon/hotarufx/bundles/CompositionBundle.java
@@ -0,0 +1,48 @@
+package com.annimon.hotarufx.bundles;
+
+import com.annimon.hotarufx.lib.Context;
+import com.annimon.hotarufx.lib.NumberValue;
+import com.annimon.hotarufx.visual.Composition;
+import lombok.val;
+
+public class CompositionBundle implements Bundle {
+
+    @Override
+    public void load(Context context) {
+        context.functions().put("composition", args -> {
+            final int width, height;
+            final double frameRate;
+            switch (args.length) {
+                case 0:
+                    width = 1280;
+                    height = 720;
+                    frameRate = 30d;
+                    break;
+                case 1:
+                    width = 1280;
+                    height = 720;
+                    frameRate = args[0].asNumber();
+                    break;
+                case 2:
+                    width = args[0].asInt();
+                    height = args[1].asInt();
+                    frameRate = 30d;
+                    break;
+                case 3:
+                default:
+                    width = args[0].asInt();
+                    height = args[1].asInt();
+                    frameRate = args[2].asNumber();
+                    break;
+            }
+            val composition = new Composition(width, height, frameRate);
+            val scene = composition.getScene();
+            context.composition(composition);
+            context.variables().put("Width", NumberValue.of(scene.getVirtualWidth()));
+            context.variables().put("Height", NumberValue.of(scene.getVirtualHeight()));
+            context.variables().put("HalfWidth", NumberValue.of(scene.getVirtualWidth() / 2));
+            context.variables().put("HalfHeight", NumberValue.of(scene.getVirtualHeight() / 2));
+            return NumberValue.ZERO;
+        });
+    }
+}
diff --git a/app/src/main/java/com/annimon/hotarufx/lib/Context.java b/app/src/main/java/com/annimon/hotarufx/lib/Context.java
index 20eaf6e..d6363fc 100644
--- a/app/src/main/java/com/annimon/hotarufx/lib/Context.java
+++ b/app/src/main/java/com/annimon/hotarufx/lib/Context.java
@@ -1,5 +1,6 @@
 package com.annimon.hotarufx.lib;
 
+import com.annimon.hotarufx.visual.Composition;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
@@ -7,6 +8,7 @@ public final class Context {
 
     private final Map<String, Value> variables;
     private final Map<String, Function> functions;
+    private Composition composition;
 
     public Context() {
         variables = new ConcurrentHashMap<>();
@@ -20,4 +22,12 @@ public final class Context {
     public Map<String, Function> functions() {
         return functions;
     }
+
+    public Composition composition() {
+        return composition;
+    }
+
+    public void composition(Composition composition) {
+        this.composition = composition;
+    }
 }
diff --git a/app/src/test/java/com/annimon/hotarufx/bundles/CompositionBundleTest.java b/app/src/test/java/com/annimon/hotarufx/bundles/CompositionBundleTest.java
new file mode 100644
index 0000000..5ec0385
--- /dev/null
+++ b/app/src/test/java/com/annimon/hotarufx/bundles/CompositionBundleTest.java
@@ -0,0 +1,36 @@
+package com.annimon.hotarufx.bundles;
+
+import com.annimon.hotarufx.lib.Context;
+import com.annimon.hotarufx.lib.NumberValue;
+import lombok.val;
+import org.junit.jupiter.api.Test;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+
+class CompositionBundleTest {
+
+    @Test
+    void testBundle() {
+        val context = new Context();
+        BundleLoader.loadSingle(context, CompositionBundle.class);
+
+        assertThat(context.functions(), hasKey("composition"));
+        assertThat(context.composition(), nullValue());
+        assertThat(context.variables(), allOf(
+                not(hasKey("Width")),
+                not(hasKey("Height")),
+                not(hasKey("HalfWidth")),
+                not(hasKey("HalfHeight"))
+        ));
+
+        context.functions().get("composition").execute();
+
+        assertThat(context.composition(), notNullValue());
+        assertThat(context.variables(), allOf(
+                hasEntry("Width", NumberValue.of(1920)),
+                hasEntry("Height", NumberValue.of(1080)),
+                hasEntry("HalfWidth", NumberValue.of(960)),
+                hasEntry("HalfHeight", NumberValue.of(540))
+        ));
+    }
+}
\ No newline at end of file