diff --git a/app/src/main/java/com/annimon/hotarufx/Main.java b/app/src/main/java/com/annimon/hotarufx/Main.java
index 9d99e39..0816167 100644
--- a/app/src/main/java/com/annimon/hotarufx/Main.java
+++ b/app/src/main/java/com/annimon/hotarufx/Main.java
@@ -1,12 +1,17 @@
 package com.annimon.hotarufx;
 
-import com.annimon.hotarufx.visual.Composition;
-import com.annimon.hotarufx.visual.KeyFrame;
-import com.annimon.hotarufx.visual.objects.CircleNode;
-import com.annimon.hotarufx.visual.visitors.RenderVisitor;
+import com.annimon.hotarufx.bundles.BundleLoader;
+import com.annimon.hotarufx.bundles.CompositionBundle;
+import com.annimon.hotarufx.bundles.NodesBundle;
+import com.annimon.hotarufx.lexer.HotaruLexer;
+import com.annimon.hotarufx.lib.Context;
+import com.annimon.hotarufx.parser.HotaruParser;
+import com.annimon.hotarufx.parser.visitors.InterpreterVisitor;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Arrays;
 import javafx.application.Application;
-import javafx.scene.paint.Color;
-import javafx.scene.paint.Paint;
 import javafx.stage.Stage;
 import lombok.val;
 
@@ -14,49 +19,17 @@ public class Main extends Application {
 
     @Override
     public void start(Stage primaryStage) {
-        val composition = new Composition(1280, 720, 30);
-        val scene = composition.getScene();
+        val input = readProgram("/main.hfx");
+        val context = new Context();
+        BundleLoader.load(context, Arrays.asList(
+                CompositionBundle.class,
+                NodesBundle.class
+        ));
 
-        val colors = new Paint[] {Color.GREEN, Color.RED};
-        val halfWidth = scene.getVirtualWidth() / 2;
-        val halfHeight = scene.getVirtualHeight() / 2;
-        val renderVisitor = new RenderVisitor(composition.getTimeline());
-        for (int y = -1; y <= 1; y++) {
-            for (int x = -1; x <= 1; x++) {
-                val node = new CircleNode();
-                val colorIndex = Math.abs(x * y);
-                node.circle.setFill(colors[colorIndex]);
-                node.circle.setCenterX(x * halfWidth);
-                node.circle.setCenterY(y * halfHeight);
-                node.circle.setRadius(50);
-                node.radiusProperty()
-                        .add(KeyFrame.of(30), 70)
-                        .add(KeyFrame.of(90), 20)
-                        .add(KeyFrame.of(300), 70);
-                node.fillProperty()
-                        .add(KeyFrame.of(150), colors[1 - colorIndex])
-                        .add(KeyFrame.of(300), colors[colorIndex]);
-                if (x == 0 && y == 0) {
-                    node.centerXProperty()
-                            .add(KeyFrame.of(60), 0)
-                            .add(KeyFrame.of(90), -400)
-                            .add(KeyFrame.of(150), 400)
-                            .add(KeyFrame.of(180), 0);
-                    node.centerYProperty()
-                            .add(KeyFrame.of(180), 0)
-                            .add(KeyFrame.of(210), -400)
-                            .add(KeyFrame.of(270), 400)
-                            .add(KeyFrame.of(300), 0);
-                    node.radiusProperty()
-                            .add(KeyFrame.of(320), 180);
-                    node.fillProperty()
-                            .add(KeyFrame.of(300), node.circle.getFill())
-                            .add(KeyFrame.of(320), Color.WHITE);
-                }
-                node.accept(renderVisitor, scene);
-            }
-        }
+        HotaruParser.parse(HotaruLexer.tokenize(input))
+                .accept(new InterpreterVisitor(), context);
 
+        val composition = context.composition();
         primaryStage.setTitle("HotaruFX");
         primaryStage.setScene(composition.produceAnimationScene());
         composition.getTimeline().getFxTimeline().play();
@@ -66,4 +39,23 @@ public class Main extends Application {
     public static void main(String[] args) {
         launch(args);
     }
+
+    private static String readProgram(String path) {
+        val fallbackProgram = "composition(640, 480, 25)";
+        try (InputStream is = Main.class.getResourceAsStream(path)) {
+            if (is == null) {
+                return fallbackProgram;
+            }
+            val baos = new ByteArrayOutputStream();
+            val bufferSize = 4096;
+            val buffer = new byte[bufferSize];
+            int read;
+            while ((read = is.read(buffer, 0, bufferSize)) != -1)  {
+                baos.write(buffer, 0, read);
+            }
+            return baos.toString("UTF-8");
+        } catch (IOException ioe) {
+            return fallbackProgram;
+        }
+    }
 }
diff --git a/app/src/main/java/com/annimon/hotarufx/bundles/CompositionBundle.java b/app/src/main/java/com/annimon/hotarufx/bundles/CompositionBundle.java
index cd28c89..cb90300 100644
--- a/app/src/main/java/com/annimon/hotarufx/bundles/CompositionBundle.java
+++ b/app/src/main/java/com/annimon/hotarufx/bundles/CompositionBundle.java
@@ -1,8 +1,12 @@
 package com.annimon.hotarufx.bundles;
 
 import com.annimon.hotarufx.lib.Context;
+import com.annimon.hotarufx.lib.NodeValue;
 import com.annimon.hotarufx.lib.NumberValue;
+import com.annimon.hotarufx.lib.Types;
 import com.annimon.hotarufx.visual.Composition;
+import com.annimon.hotarufx.visual.visitors.RenderVisitor;
+import java.util.Arrays;
 import lombok.val;
 
 public class CompositionBundle implements Bundle {
@@ -44,5 +48,15 @@ public class CompositionBundle implements Bundle {
             context.variables().put("HalfHeight", NumberValue.of(scene.getVirtualHeight() / 2));
             return NumberValue.ZERO;
         });
+
+        context.functions().put("render", args -> {
+            val renderVisitor = new RenderVisitor(context.composition().getTimeline());
+            val scene = context.composition().getScene();
+            Arrays.stream(args)
+                    .filter(v -> v.type() == Types.NODE)
+                    .map(v -> ((NodeValue) v).getNode())
+                    .forEach(node -> node.accept(renderVisitor, scene));
+            return NumberValue.ZERO;
+        });
     }
 }
diff --git a/app/src/main/resources/main.hfx b/app/src/main/resources/main.hfx
new file mode 100644
index 0000000..0cbdd5c
--- /dev/null
+++ b/app/src/main/resources/main.hfx
@@ -0,0 +1,10 @@
+composition(1280, 720, 30)
+
+A = circle({
+  centerX: 0,
+  centerY: 0,
+  radius: 50,
+  fill: "red"
+})
+
+render(A)
\ No newline at end of file