diff --git a/ComposeWindow.java b/ComposeWindow.java
index 21d2e14..35a9118 100644
--- a/ComposeWindow.java
+++ b/ComposeWindow.java
@@ -19,6 +19,16 @@ ComposeWindow extends JFrame {
     private ComposeComponent
     display;
 
+//   -  -%-  -
+
+    private static final Composition
+    NULL_COMPOSITION = new Composition();
+    {
+        NULL_COMPOSITION.text = "This is a sample composition..!";
+        NULL_COMPOSITION.visibility = PostVisibility.PUBLIC;
+        NULL_COMPOSITION.replyToPostId = null;
+    }
+
 //  ---%-@-%---
 
     public void
diff --git a/JKomasto.java b/JKomasto.java
index c845b4b..5f9dac8 100644
--- a/JKomasto.java
+++ b/JKomasto.java
@@ -17,6 +17,8 @@ JKomasto {
     JKomasto()
     {
         new TimelineWindow().setVisible(true);
+        new ComposeWindow().setVisible(true);
+        new PostWindow().setVisible(true);
     }
 
 //   -  -%-  -
@@ -41,9 +43,36 @@ JKomasto {
 
 
 
+enum
+PostVisibility {
+
+    PUBLIC,
+    LOCAL,
+    FOLLOWERS,
+    MENTIONED
+
+}
+
+enum
+TimelineType {
+
+    FEDERATED,
+    LOCAL,
+    HOME,
+    MENTIONS,
+    MESSAGES,
+    LIST
+
+}
+
+
+
 class
 Timeline {
 
+    public TimelineType
+    type;
+
 }
 
 
@@ -51,6 +80,24 @@ Timeline {
 class
 Post {
 
+    public String
+    text;
+
+    public String
+    authorId, authorName;
+
+    public String
+    date;
+
+    public PostVisibility
+    visibility;
+
+    public String
+    postId;
+
+    public boolean
+    boosted, favourited;
+
 }
 
 
@@ -58,4 +105,13 @@ Post {
 class
 Composition {
 
+    public String
+    text;
+
+    public PostVisibility
+    visibility;
+
+    public String
+    replyToPostId;
+
 }
diff --git a/PostWindow.java b/PostWindow.java
index c7f6e3e..8844485 100644
--- a/PostWindow.java
+++ b/PostWindow.java
@@ -28,6 +28,21 @@ PostWindow extends JFrame {
     private RepliesComponent
     repliesDisplay;
 
+//   -  -%-  -
+
+    private static final Post
+    NULL_POST = new Post();
+    {
+        NULL_POST.text = "This is a sample post.";
+        NULL_POST.authorId = "snowyfox@biskuteri.cafe";
+        NULL_POST.authorName = "snowyfox";
+        NULL_POST.date = "0712hrs, 17 July";
+        NULL_POST.visibility = PostVisibility.MENTIONED;
+        NULL_POST.postId = "000000000";
+        NULL_POST.boosted = false;
+        NULL_POST.favourited = true;
+    }
+
 //  ---%-@-%---
 
     public void
diff --git a/TimelineWindow.java b/TimelineWindow.java
index d544a0c..05d777e 100644
--- a/TimelineWindow.java
+++ b/TimelineWindow.java
@@ -30,6 +30,14 @@ TimelineWindow extends JFrame {
     private TimelineComponent
     display;
 
+//   -  -%-  -
+
+    private static final Timeline
+    NULL_TIMELINE = new Timeline();
+    {
+        NULL_TIMELINE.type = TimelineType.LOCAL;
+    }
+
 //  ---%-@-%---
 
     public void