diff --git a/crates/tek_core/src/space.rs b/crates/tek_core/src/space.rs
index 5427c160..366f588c 100644
--- a/crates/tek_core/src/space.rs
+++ b/crates/tek_core/src/space.rs
@@ -133,16 +133,16 @@ pub trait Area<N: Coordinate>: Copy {
     #[inline] fn split_fixed (&self, direction: Direction, a: N) -> ([N;4],[N;4]) {
         match direction {
             Direction::Up => (
-                [self.x(), self.y() + self.h() - a, self.w(), a],
-                [self.x(), self.y(), self.w(), self.h() - a],
+                [self.x(), (self.y()+self.h()).minus(a), self.w(), a],
+                [self.x(), self.y(), self.w(), self.h().minus(a)],
             ),
             Direction::Down => (
                 [self.x(), self.y(), self.w(), a],
-                [self.x(), self.y() + a, self.w(), self.h() - a],
+                [self.x(), self.y() + a, self.w(), self.h().minus(a)],
             ),
             Direction::Right => (
                 [self.x(), self.y(), a, self.h()],
-                [self.x() + a, self.y(), self.w() - a, self.h()],
+                [self.x() + a, self.y(), self.w().minus(a), self.h()],
             ),
             _ => todo!(),
         }
@@ -290,24 +290,14 @@ where
     }
 }
 
-//`Layers<_,   impl (Fn(&mut dyn FnMut(&dyn Widget<Engine = _>)   -> Result<(), Box<...>>)                               -> ...                                               ) + Send + Sync>`
-//`Layers<Tui, impl (Fn(&mut dyn FnMut(&dyn Widget<Engine = Tui>) -> Result<(), Box<(dyn std::error::Error + 'static)>>) -> Result<(), Box<(dyn std::error::Error + 'static)>>) + Send + Sync + '_>`
-
-#[derive(Copy, Clone)]
-pub enum Direction {
-    Up,
-    Down,
-    Left,
-    Right,
-}
-
+#[derive(Copy, Clone, PartialEq)]
+pub enum Direction { Up, Down, Left, Right, }
 impl Direction {
-    pub fn is_down (&self) -> bool {
-        match self { Self::Down => true, _ => false }
-    }
-    pub fn is_right (&self) -> bool {
-        match self { Self::Right => true, _ => false }
-    }
+    pub fn is_up    (&self) -> bool { match self { Self::Up    => true, _ => false } }
+    pub fn is_down  (&self) -> bool { match self { Self::Down  => true, _ => false } }
+    pub fn is_left  (&self) -> bool { match self { Self::Left  => true, _ => false } }
+    pub fn is_right (&self) -> bool { match self { Self::Right => true, _ => false } }
+    /// Return next direction clockwise
     pub fn cw (&self) -> Self {
         match self {
             Self::Up    => Self::Right,
@@ -316,6 +306,7 @@ impl Direction {
             Self::Right => Self::Down,
         }
     }
+    /// Return next direction counterclockwise
     pub fn ccw (&self) -> Self {
         match self {
             Self::Up    => Self::Left,