diff --git a/cursetree/cursetree.c b/cursetree/cursetree.c
index 8d80831..a5f178f 100644
--- a/cursetree/cursetree.c
+++ b/cursetree/cursetree.c
@@ -1,264 +1,16 @@
-#include <assert.h>
 #include <stdlib.h>
-#include <string.h>
 
 #include "ncrswrap.h"
-#include "cursetree.h"
-
-/* Internal allocator method for crs_node structures.
- */
-static inline struct crs_node *__alloc_node(const enum crs_nodetype type) {
-  struct crs_node *node = (struct crs_node *)malloc(sizeof(struct crs_node));
-  node->type = type;
-  return node;
-}
-
-/* Construct a new window node (crs_node of type NODE_WIN).
- */
-static struct crs_node *init_window_node(WINDOW *const win) {
-  struct crs_node *node = __alloc_node(NODE_WINDOW);
-  node->win = win;
-
-  return node;
-}
-
-static struct crs_node *
-auto_window_node(const struct crs_nodedims *const dims) {
-  WINDOW *win = newwin(dims->height, dims->width, dims->y, dims->x);
-  return init_window_node(win);
-}
-
-static struct crs_node *init_abstract_node(struct crs_node *const node0,
-                                           struct crs_node *const node1,
-                                           const enum crs_axis axis,
-                                           const float ratio,
-                                           struct crs_nodedims *const dims) {
-  struct crs_node *node = __alloc_node(NODE_ABSTRACT);
-  node->axis = axis;
-  node->ratio = ratio;
-  node->dims = dims;
-
-  node->child[0] = node0;
-  node->child[1] = node1;
-  return node;
-}
-
-static void destroy_node(struct crs_node *const node) {
-  if (node->type == NODE_WINDOW) {
-    /* Window Node */
-    delwin(node->win);
-    goto end;
-  }
-  /* Abstract Node */
-  assert(node->type == NODE_ABSTRACT);
-  destroy_node(node->child[0]);
-  destroy_node(node->child[1]);
-  free(node->dims);
-
-end:
-  free(node);
-}
-
-static inline struct crs_nodedims *__alloc_dims(int x, int y, int width,
-                                                int height) {
-  struct crs_nodedims *dims;
-
-  dims = (struct crs_nodedims *)malloc(sizeof(struct crs_nodedims));
-  *dims = (struct crs_nodedims){
-      .x = x,
-      .y = y,
-      .width = width,
-      .height = height,
-  };
-  return dims;
-}
-
-static inline struct crs_nodedims *
-__dup_dims(const struct crs_nodedims *const dims) {
-  struct crs_nodedims *dup;
-  dup = (struct crs_nodedims *)malloc(sizeof(struct crs_nodedims));
-  memcpy(dup, dims, sizeof(struct crs_nodedims));
-
-  return dup;
-}
-
-static inline struct crs_nodedims *termdims(void) {
-  struct crs_nodedims *dims = __alloc_dims(0, 0, 0, 0);
-  termsize(dims->width, dims->height);
-
-  return dims;
-}
-
-static inline void nodesize(const struct crs_node *const node, int *const width,
-                            int *const height) {
-  if (node->type == NODE_WINDOW) {
-    /* Window Node */
-    getmaxyx(node->win, *height, *width);
-  } else {
-    /* Abstract Node */
-    assert(node->type == NODE_ABSTRACT);
-    *width = node->dims->width;
-    *height = node->dims->height;
-  }
-}
-
-static inline struct crs_nodedims *nodedims(const struct crs_node *const node) {
-  struct crs_nodedims *dims;
-  if (node->type == NODE_WINDOW) {
-    /* Window Node */
-    dims = (struct crs_nodedims *)malloc(sizeof(struct crs_nodedims));
-    getbegyx(node->win, dims->y, dims->x);
-    getmaxyx(node->win, dims->height, dims->width);
-  } else {
-    /* Abstract Node */
-    assert(node->type == NODE_ABSTRACT);
-    dims = __dup_dims(node->dims);
-  }
-
-  return dims;
-}
-
-/* Calculate the dimensions for nodes resulting from a bifurcation.
- * Returns 0 on success, and 1 on failure if any width/height are 0 characters.
- * WARNING: This function does not guarantee the x,y positions returned
- * WARNING: are valid screen coordinates.
- */
-static int bifurcate_dims(const struct crs_nodedims *const parent_dims,
-                          const enum crs_axis axis, const float ratio,
-                          struct crs_nodedims **const dims0,
-                          struct crs_nodedims **const dims1) {
-  assert(0 < ratio && ratio < 1);
-  struct crs_nodedims *_dims0, *_dims1;
-
-  _dims0 = __dup_dims(parent_dims);
-  _dims1 = __dup_dims(parent_dims);
-
-  if (axis == AXIS_X) {
-    _dims0->width *= ratio;
-    _dims1->width -= _dims0->width;
-    _dims1->x += _dims0->width;
-  } else {
-    _dims0->height *= ratio;
-    _dims1->height -= _dims0->height;
-    _dims1->y += _dims0->height;
-  }
-
-  if (!_dims0->width || !_dims0->height || !_dims1->width || !_dims1->height)
-    return 1;
-
-  // propagate bifurcated dimensions
-  *dims0 = _dims0;
-  *dims1 = _dims1;
-  return 0;
-}
-
-/* NOTE: resize_node calls wnoutrefresh(3x), which expects
- * NOTE: a call doupdate(3x) call afterwards to flush ncurses
- * NOTE: virtual screen to the physical screen.
- */
-static void resize_node(struct crs_node *const node,
-                        struct crs_nodedims *const new_dims) {
-  if (node->type == NODE_WINDOW) {
-    /* Window Node */
-    resizemv_window(new_dims->x, new_dims->y, new_dims->width, new_dims->height,
-                    node->win);
-    free(new_dims);
-
-    wnoutrefresh(node->win);
-  } else {
-    /* Abstract Node */
-    assert(node->type == NODE_ABSTRACT);
-    struct crs_nodedims *dims0, *dims1;
-
-    free(node->dims);
-    node->dims = new_dims;
-    bifurcate_dims(new_dims, node->axis, node->ratio, &dims0, &dims1);
-
-    resize_node(node->child[0], dims0);
-    resize_node(node->child[1], dims1);
-  }
-}
-
-/* Subdivide a window node's allocated region into two window nodes
- * replacing the original node with an abstract node.
- * Parameters:
- *   axis   - controls which direction the subdivision occurs
- *   invert_axis - invert index of the original node in the new abstract node
- */
-void bifurcate_window_node(struct crs_node **const node,
-                           const enum crs_axis axis, const int invert_axis,
-                           const float ratio) {
-  assert((*node)->type == NODE_WINDOW);
-  struct crs_nodedims *dims0, *dims1;
-  struct crs_node *node0, *node1;
-
-  struct crs_nodedims *original_dims = nodedims(*node);
-  if (bifurcate_dims(original_dims, axis, ratio, &dims0, &dims1)) {
-    /* TODO: handle this error properly */
-    free(original_dims);
-    exit(1);
-    return;
-  }
-
-  if (invert_axis) {
-    /* Inverted Bifurcation */
-    node0 = auto_window_node(dims0);
-    node1 = *node;
-    resize_node(node1, dims1);
-  } else {
-    /* Non-Inverted Bifurcation */
-    node0 = *node;
-    node1 = auto_window_node(dims1);
-    resize_node(node0, dims0);
-  }
-
-  *node = init_abstract_node(node0, node1, axis, ratio, original_dims);
-}
-
-/* Collapse an abstract node, killing one child node and resizing
- * the other to take its place.
- */
-static void collapse_abstract_node(struct crs_node **const node,
-                                   const int collapse_i) {
-  assert((*node)->type == NODE_ABSTRACT);
-  assert(0 <= collapse_i && collapse_i < NODE_CHILD_N);
-
-  // WARNING: only works for NODE_CHILD_N=2 (binary trees)
-  destroy_node((*node)->child[!collapse_i]);
-
-  struct crs_node *collapse_target = (*node)->child[collapse_i];
-  free(*node);
-  *node = collapse_target;
-}
-
-/*
- */
-static struct crs_node *init_root_node(void) {
-  WINDOW *rootwin;
-
-  rootwin = root_window();
-  return init_window_node(rootwin);
-}
+#include "tree.h"
 
 int ct_init(struct crs_tree **const tree) {
-  *tree = (struct crs_tree *)malloc(sizeof(struct crs_tree));
-
   /* Initialise NCurses Library & Root Node */
   init_ncurses();
-  (*tree)->root = init_root_node();
+  init_tree(tree);
 
   return EXIT_SUCCESS;
 }
 
-void destroy_tree(struct crs_tree *const tree) {
-  destroy_node(tree->root);
-  endwin();
-  free(tree);
-}
-
-void resize_tree(struct crs_tree *const tree, struct crs_nodedims *const dims) {
-  resize_node(tree->root, dims);
-}
 
 void ct_update(struct crs_tree *const tree) {
   struct crs_nodedims * term_dims;
diff --git a/cursetree/cursetree.h b/cursetree/cursetree.h
index 74d804f..abbf9e9 100644
--- a/cursetree/cursetree.h
+++ b/cursetree/cursetree.h
@@ -1,63 +1,10 @@
 #ifndef CURSETREE_CURSETREE_H
 #define CURSETREE_CURSETREE_H
 
-#ifndef __NCURSES_H
-typedef struct _win_st WINDOW;
-#endif /* __NCURSES_H */
-
-#define NODE_CHILD_N 2
-
-/* MACRO:
- * Get widnow node start x,y coordinates, width, & height.
- * void NODEDIMS(struct crs_node *node, struct crs_nodedims dims);
- */
-#define GET_WNODEDIMS(dims, node)                                              \
-  (getbegyx((node)->win, dims.y, dims.x));                                     \
-  getmaxyx((node)->win, dims.y, dims.x)
-
-enum crs_nodetype {
-  NODE_WINDOW,
-  NODE_ABSTRACT,
-};
-
-/* Stores a node's starting x,y coordinates, width, & height.
- * NOTE: Intended for interfunction communication.
- */
-struct crs_nodedims {
-  int x, y, width, height;
-};
-
-enum crs_axis {
-  AXIS_X,
-  AXIS_Y,
-};
-
-struct crs_node {
-  enum crs_nodetype type;
-  // union value depends on crs_node.type
-  union {
-    WINDOW *win;
-    struct {
-      enum crs_axis axis;
-      float ratio;
-      struct crs_nodedims *dims;
-      struct crs_node *child[NODE_CHILD_N];
-    };
-  };
-};
-
-struct crs_tree {
-  struct crs_node *root;
-};
+#include "tree.h"
 
 /* === External Interface === */
 int ct_init(struct crs_tree **const tree);
-void destroy_tree(struct crs_tree *const tree);
-void resize_tree(struct crs_tree *const tree, struct crs_nodedims *const dims);
 void ct_update(struct crs_tree *const tree);
 
-void bifurcate_window_node(struct crs_node **const node,
-                           const enum crs_axis axis, const int invert_axis,
-                           const float ratio);
-
 #endif /* CURSETREE_CURSETREE_H */
diff --git a/cursetree/node.c b/cursetree/node.c
new file mode 100644
index 0000000..38f7129
--- /dev/null
+++ b/cursetree/node.c
@@ -0,0 +1,232 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "ncrswrap.h"
+#include "node.h"
+
+/* Internal allocator method for crs_node structures.
+ */
+static inline struct crs_node *__alloc_node(const enum crs_nodetype type) {
+  struct crs_node *node = (struct crs_node *)malloc(sizeof(struct crs_node));
+  node->type = type;
+  return node;
+}
+
+/* Construct a new window node (crs_node of type NODE_WIN).
+ */
+struct crs_node *init_window_node(WINDOW *const win) {
+  struct crs_node *node = __alloc_node(NODE_WINDOW);
+  node->win = win;
+
+  return node;
+}
+
+static struct crs_node *
+auto_window_node(const struct crs_nodedims *const dims) {
+  WINDOW *win = newwin(dims->height, dims->width, dims->y, dims->x);
+  return init_window_node(win);
+}
+
+static struct crs_node *init_abstract_node(struct crs_node *const node0,
+                                           struct crs_node *const node1,
+                                           const enum crs_axis axis,
+                                           const float ratio,
+                                           struct crs_nodedims *const dims) {
+  struct crs_node *node = __alloc_node(NODE_ABSTRACT);
+  node->axis = axis;
+  node->ratio = ratio;
+  node->dims = dims;
+
+  node->child[0] = node0;
+  node->child[1] = node1;
+  return node;
+}
+
+void destroy_node(struct crs_node *const node) {
+  if (node->type == NODE_WINDOW) {
+    /* Window Node */
+    delwin(node->win);
+    goto end;
+  }
+  /* Abstract Node */
+  assert(node->type == NODE_ABSTRACT);
+  destroy_node(node->child[0]);
+  destroy_node(node->child[1]);
+  free(node->dims);
+
+end:
+  free(node);
+}
+
+static inline struct crs_nodedims *__alloc_dims(int x, int y, int width,
+                                                int height) {
+  struct crs_nodedims *dims;
+
+  dims = (struct crs_nodedims *)malloc(sizeof(struct crs_nodedims));
+  *dims = (struct crs_nodedims){
+      .x = x,
+      .y = y,
+      .width = width,
+      .height = height,
+  };
+  return dims;
+}
+
+static inline struct crs_nodedims *
+__dup_dims(const struct crs_nodedims *const dims) {
+  struct crs_nodedims *dup;
+  dup = (struct crs_nodedims *)malloc(sizeof(struct crs_nodedims));
+  memcpy(dup, dims, sizeof(struct crs_nodedims));
+
+  return dup;
+}
+
+static inline struct crs_nodedims *termdims(void) {
+  struct crs_nodedims *dims = __alloc_dims(0, 0, 0, 0);
+  termsize(dims->width, dims->height);
+
+  return dims;
+}
+
+static inline void nodesize(const struct crs_node *const node, int *const width,
+                            int *const height) {
+  if (node->type == NODE_WINDOW) {
+    /* Window Node */
+    getmaxyx(node->win, *height, *width);
+  } else {
+    /* Abstract Node */
+    assert(node->type == NODE_ABSTRACT);
+    *width = node->dims->width;
+    *height = node->dims->height;
+  }
+}
+
+static inline struct crs_nodedims *nodedims(const struct crs_node *const node) {
+  struct crs_nodedims *dims;
+  if (node->type == NODE_WINDOW) {
+    /* Window Node */
+    dims = (struct crs_nodedims *)malloc(sizeof(struct crs_nodedims));
+    getbegyx(node->win, dims->y, dims->x);
+    getmaxyx(node->win, dims->height, dims->width);
+  } else {
+    /* Abstract Node */
+    assert(node->type == NODE_ABSTRACT);
+    dims = __dup_dims(node->dims);
+  }
+
+  return dims;
+}
+
+/* Calculate the dimensions for nodes resulting from a bifurcation.
+ * Returns 0 on success, and 1 on failure if any width/height are 0 characters.
+ * WARNING: This function does not guarantee the x,y positions returned
+ * WARNING: are valid screen coordinates.
+ */
+static int bifurcate_dims(const struct crs_nodedims *const parent_dims,
+                          const enum crs_axis axis, const float ratio,
+                          struct crs_nodedims **const dims0,
+                          struct crs_nodedims **const dims1) {
+  assert(0 < ratio && ratio < 1);
+  struct crs_nodedims *_dims0, *_dims1;
+
+  _dims0 = __dup_dims(parent_dims);
+  _dims1 = __dup_dims(parent_dims);
+
+  if (axis == AXIS_X) {
+    _dims0->width *= ratio;
+    _dims1->width -= _dims0->width;
+    _dims1->x += _dims0->width;
+  } else {
+    _dims0->height *= ratio;
+    _dims1->height -= _dims0->height;
+    _dims1->y += _dims0->height;
+  }
+
+  if (!_dims0->width || !_dims0->height || !_dims1->width || !_dims1->height)
+    return 1;
+
+  // propagate bifurcated dimensions
+  *dims0 = _dims0;
+  *dims1 = _dims1;
+  return 0;
+}
+
+/* NOTE: resize_node calls wnoutrefresh(3x), which expects
+ * NOTE: a call doupdate(3x) call afterwards to flush ncurses
+ * NOTE: virtual screen to the physical screen.
+ */
+void resize_node(struct crs_node *const node,
+                 struct crs_nodedims *const new_dims) {
+  if (node->type == NODE_WINDOW) {
+    /* Window Node */
+    resizemv_window(new_dims->x, new_dims->y, new_dims->width, new_dims->height,
+                    node->win);
+    free(new_dims);
+
+    wnoutrefresh(node->win);
+  } else {
+    /* Abstract Node */
+    assert(node->type == NODE_ABSTRACT);
+    struct crs_nodedims *dims0, *dims1;
+
+    free(node->dims);
+    node->dims = new_dims;
+    bifurcate_dims(new_dims, node->axis, node->ratio, &dims0, &dims1);
+
+    resize_node(node->child[0], dims0);
+    resize_node(node->child[1], dims1);
+  }
+}
+
+/* Subdivide a window node's allocated region into two window nodes
+ * replacing the original node with an abstract node.
+ * Parameters:
+ *   axis   - controls which direction the subdivision occurs
+ *   invert_axis - invert index of the original node in the new abstract node
+ */
+void bifurcate_window_node(struct crs_node **const node,
+                           const enum crs_axis axis, const int invert_axis,
+                           const float ratio) {
+  assert((*node)->type == NODE_WINDOW);
+  struct crs_nodedims *dims0, *dims1;
+  struct crs_node *node0, *node1;
+
+  struct crs_nodedims *original_dims = nodedims(*node);
+  if (bifurcate_dims(original_dims, axis, ratio, &dims0, &dims1)) {
+    /* TODO: handle this error properly */
+    free(original_dims);
+    exit(1);
+    return;
+  }
+
+  if (invert_axis) {
+    /* Inverted Bifurcation */
+    node0 = auto_window_node(dims0);
+    node1 = *node;
+    resize_node(node1, dims1);
+  } else {
+    /* Non-Inverted Bifurcation */
+    node0 = *node;
+    node1 = auto_window_node(dims1);
+    resize_node(node0, dims0);
+  }
+
+  *node = init_abstract_node(node0, node1, axis, ratio, original_dims);
+}
+
+/* Collapse an abstract node, killing one child node and resizing
+ * the other to take its place.
+ */
+static void collapse_abstract_node(struct crs_node **const node,
+                                   const int collapse_i) {
+  assert((*node)->type == NODE_ABSTRACT);
+  assert(0 <= collapse_i && collapse_i < NODE_CHILD_N);
+
+  // WARNING: only works for NODE_CHILD_N=2 (binary trees)
+  destroy_node((*node)->child[!collapse_i]);
+
+  struct crs_node *collapse_target = (*node)->child[collapse_i];
+  free(*node);
+  *node = collapse_target;
+}
diff --git a/cursetree/node.h b/cursetree/node.h
index bf789c3..bf94f2b 100644
--- a/cursetree/node.h
+++ b/cursetree/node.h
@@ -47,5 +47,13 @@ struct crs_node {
 };
 
 /* === External Interface === */
+struct crs_node *init_window_node(WINDOW *const win);
+void destroy_node(struct crs_node *const node);
+void resize_node(struct crs_node *const node,
+                 struct crs_nodedims *const new_dims);
+
+void bifurcate_window_node(struct crs_node **const node,
+                           const enum crs_axis axis, const int invert_axis,
+                           const float ratio);
 
 #endif /* CURSETREE_NODE_H */
diff --git a/cursetree/tree.c b/cursetree/tree.c
new file mode 100644
index 0000000..61c268b
--- /dev/null
+++ b/cursetree/tree.c
@@ -0,0 +1,30 @@
+#include <stdlib.h>
+
+#include "ncrswrap.h"
+#include "tree.h"
+
+/*
+ */
+static struct crs_node *init_root_node(void) {
+  WINDOW *rootwin;
+
+  rootwin = root_window();
+  return init_window_node(rootwin);
+}
+
+int init_tree(struct crs_tree **const tree) {
+    *tree = (struct crs_tree *)malloc(sizeof(struct crs_tree));
+    (*tree)->root = init_root_node();
+return EXIT_SUCCESS;
+}
+
+void destroy_tree(struct crs_tree *const tree) {
+  destroy_node(tree->root);
+  endwin();
+  free(tree);
+}
+
+void resize_tree(struct crs_tree *const tree, struct crs_nodedims *const dims) {
+  resize_node(tree->root, dims);
+}
+
diff --git a/cursetree/tree.h b/cursetree/tree.h
new file mode 100644
index 0000000..4b07547
--- /dev/null
+++ b/cursetree/tree.h
@@ -0,0 +1,15 @@
+#ifndef CURSETREE_TREE_H
+#define CURSETREE_TREE_H
+
+#include "node.h"
+
+struct crs_tree {
+  struct crs_node *root;
+};
+
+/* === External Interface === */
+int init_tree(struct crs_tree **const tree);
+void destroy_tree(struct crs_tree *const tree);
+void resize_tree(struct crs_tree *const tree, struct crs_nodedims *const dims);
+
+#endif /* CURSETREE_TREE_H */