diff --git a/source/durandal/ffi.rs b/source/durandal/ffi.rs
index 37ee01c..4931034 100644
--- a/source/durandal/ffi.rs
+++ b/source/durandal/ffi.rs
@@ -50,6 +50,11 @@ impl CStringVec
    }
 }
 
+impl Default for CStringVec
+{
+   fn default() -> Self {Self::new()}
+}
+
 /// An owned null-terminated string vector.
 #[derive(Debug)]
 pub struct CStringVec
diff --git a/source/rozinante.rs b/source/rozinante.rs
index 96e17cb..260c5eb 100644
--- a/source/rozinante.rs
+++ b/source/rozinante.rs
@@ -2,5 +2,6 @@
 
 pub mod color;
 pub mod draw;
+pub mod editor;
 
 // EOF
diff --git a/source/rozinante/color.rs b/source/rozinante/color.rs
index 939f7d8..790c9ee 100644
--- a/source/rozinante/color.rs
+++ b/source/rozinante/color.rs
@@ -2,7 +2,7 @@
 
 use crate::durandal::image::Color16;
 
-pub const CR_RED:      Color16 = Color16::new(0xFFFF, 0, 0);
-pub const CR_DARK_RED: Color16 = Color16::new(0x4700, 0, 0);
+pub const RED:      Color16 = Color16::new(0xFFFF, 0, 0);
+pub const DARK_RED: Color16 = Color16::new(0x4700, 0, 0);
 
 // EOF
diff --git a/source/tycho/editor.rs b/source/rozinante/editor.rs
similarity index 65%
rename from source/tycho/editor.rs
rename to source/rozinante/editor.rs
index 25745c9..3192f0d 100644
--- a/source/tycho/editor.rs
+++ b/source/rozinante/editor.rs
@@ -4,9 +4,11 @@
 //! state and human interactions with it, but is otherwise not permitted to
 //! directly edit it.
 
-use maraiah::{durandal::image::*,
-              marathon::map,
-              rozinante::{color::*, draw::*}};
+pub mod block;
+pub mod state;
+
+use crate::durandal::image::*;
+use super::{color, draw::*};
 
 impl MapEditor
 {
@@ -21,7 +23,7 @@ impl MapEditor
    #[inline]
    pub fn open_new(&mut self)
    {
-      *self = MapEditor::Opened(MapEditorState::default());
+      *self = MapEditor::Opened(state::State::default());
    }
 
    /// Draws the screen for this editor state.
@@ -43,21 +45,20 @@ impl MapEditor
 
             d.image((dw / 2 - iw / 2, dh / 2 - ih / 2), im);
 
-            d.rect(Rect{x: 0, y: 0, w: dw, h: 18}, CR_DARK_RED);
-            d.text((4, 14), tx_top, CR_RED);
+            d.rect(Rect{x: 0, y: 0, w: dw, h: 18}, color::DARK_RED);
+            d.text((4, 14), tx_top, color::RED);
 
-            d.rect(Rect{x: 0, y: dh - 18, w: dw, h: 18}, CR_DARK_RED);
-            d.text((4, dh - 4), tx_bot, CR_RED);
+            d.rect(Rect{x: 0, y: dh - 18, w: dw, h: 18}, color::DARK_RED);
+            d.text((4, dh - 4), tx_bot, color::RED);
          }
          MapEditor::Opened(st) => {
             d.clear(Color16::new(0, 0, 0));
-            d.text((dw/2, dh/2), &format!("tool: {:?}", st.tool), CR_RED);
+            d.text((dw/2, dh/2), &format!("tool: {:?}", st.tool), color::RED);
          }
       }
    }
 
    /// Returns `true` if `self` is closed.
-   #[allow(dead_code)]
    #[inline]
    pub fn is_closed(&self) -> bool
    {
@@ -68,7 +69,6 @@ impl MapEditor
    }
 
    /// Returns `true` if `self` is opened.
-   #[allow(dead_code)]
    #[inline]
    pub fn is_opened(&self) -> bool
    {
@@ -79,40 +79,17 @@ impl MapEditor
    }
 }
 
-impl Default for Tool
+impl Default for MapEditor
 {
-   fn default() -> Tool {Tool::Points}
-}
-
-/// Copyable map state.
-#[derive(Clone, Default)]
-pub struct MapEditorStateBlock
-{
-   info: map::Minf,
-}
-
-/// The state of an opened map editor.
-#[derive(Default)]
-pub struct MapEditorState
-{
-   edit_stack: Vec<MapEditorStateBlock>,
-   tool:       Tool,
+   #[inline]
+   fn default() -> Self {Self::new_closed()}
 }
 
 /// An entire map editor, which may be opened or closed.
 pub enum MapEditor
 {
    Closed,
-   Opened(MapEditorState),
-}
-
-/// A tool in the map editor.
-#[derive(Debug)]
-pub enum Tool
-{
-   Points,
-   Lines,
-   Polygons,
+   Opened(state::State),
 }
 
 // EOF
diff --git a/source/rozinante/editor/block.rs b/source/rozinante/editor/block.rs
new file mode 100644
index 0000000..9f03e7b
--- /dev/null
+++ b/source/rozinante/editor/block.rs
@@ -0,0 +1,19 @@
+use crate::marathon::map;
+
+impl Default for Block
+{
+   #[inline]
+   fn default() -> Self
+   {
+      Self{info: map::Minf::default()}
+   }
+}
+
+/// Copyable map state.
+#[derive(Clone)]
+pub struct Block
+{
+   info: map::Minf,
+}
+
+// EOF
diff --git a/source/rozinante/editor/state.rs b/source/rozinante/editor/state.rs
new file mode 100644
index 0000000..61bfe4f
--- /dev/null
+++ b/source/rozinante/editor/state.rs
@@ -0,0 +1,48 @@
+use super::block;
+
+impl State
+{
+   fn cur_block(&self) -> &block::Block
+   {
+      self.blocks.last().unwrap()
+   }
+
+   fn cur_block_mut(&mut self) -> &mut block::Block
+   {
+      self.blocks.last_mut().unwrap()
+   }
+}
+
+impl Default for State
+{
+   #[inline]
+   fn default() -> Self
+   {
+      Self{blocks: vec![block::Block::default()],
+           tool:   Tool::default()}
+   }
+}
+
+impl Default for Tool
+{
+   #[inline]
+   fn default() -> Self {Tool::Points}
+}
+
+/// The state of an opened map editor.
+pub struct State
+{
+   pub(super) blocks: Vec<block::Block>,
+   pub(super) tool:   Tool,
+}
+
+/// A tool in the map editor.
+#[derive(Debug)]
+pub(super) enum Tool
+{
+   Points,
+   Lines,
+   Polygons,
+}
+
+// EOF
diff --git a/source/tycho/main.rs b/source/tycho/main.rs
index 0c00292..7e9f2ef 100644
--- a/source/tycho/main.rs
+++ b/source/tycho/main.rs
@@ -1,4 +1,3 @@
-mod editor;
 mod interfaces;
 
 use crate::interfaces::*;
@@ -8,10 +7,10 @@ use gio_sys::*;
 use glib_sys::*;
 use gobject_sys::*;
 use gtk_sys::*;
-use maraiah::{c_str, durandal::ffi};
+use maraiah::{c_str, durandal::ffi, rozinante::editor};
 use std::{cell::RefCell, rc::Rc};
 
-/// Called whne the application activates in order to set everything up.
+/// Called when the application activates in order to set everything up.
 unsafe extern "C" fn app_activate(app: *mut GtkApplication, edit: gpointer)
 {
    // this ref will be cloned around a bit, but will ultimately be dropped at